Saturday, September 26, 2009

Disassembling an Accordion Bass Mechanism Part 4

Disassembling an Accordion Bass Mechanism
Part 4

After you have removed the 40 Bass and
Counterbass Button Rods, cleaned them
And placed them in the jig, you can examine
The “fingers” which extend out, and which
The Bass Button Rods push down on to open
The Bass Reed Valves.

These can be cleaned as needed with Q-Tips
And Goo Be Gone. Be Careful not to bend
Them, or to leave lint from the Q-tip on them.

I sometimes cut a strip of fine sandpaper, fold
It in half, and gently clean every slot in the
Wooden guides which hold the bass button

This is a good time to make sure there are no
Loose pieces laying down inside the Bass Side
Of the Accordion. You can vacuum up any
Debris, and do other cleaning or minor repair
At this time. You may want to clean the holes
Where the bass buttons protrude, of any dirt
Or residue at this time, using a Q-Tip and Goo
Be Gone.

Once you are satisfied that everything has been
Cleaned properly, you can begin reassembly
Starting with the Bass and Counterbass
Button Rods. I usually begin from the right
Side, nearest the Air Release Valve, and work
My way to the left. As you install each rod, be
Certain that the little pins that push down on
The Bass Reed Valve Fingers, are all positioned
On the top of those fingers. This will become
Very important when you install the Chord
Bass Button Rods, All three pins on each rod
Must be on top of the fingers to make sure the
Entire chord is played when the button is

As you Install each bass button rod, gently test
It by depressing it to make sure it operates
Freely and does not rub. If a bass button rod
Seems to rub, you may need to remove it, and
Gently straighten it with a pair of pliers. Don’t
Overdo the bending, usually if a rod is rubbing
It takes just a hair of straightening to make it
Operate freely.

After installing the Bass and Counterbass Rods,
Reinstall the thin Wooden Retainer which holds
those rods in place with the screws you removed.

Then Reinstall the Chord Button Retainer Guide into
The Slot on the Stand Off, and screw it into place.
Then, Begin reinstalling the Major and Minor
Chord button rods into their respective locations
Working from the air release valve over to the left.

Again, test each rod to make sure it operates
Freely and adjust as needed. Make sure each rod
Is positioned so that it actuates three “fingers”.

Once you have reinstalled the Major and Minor
Chord Button Rods, Reinstall the Thin Plastic
Retaining Strip into the slot on the wooden
Retainer guide, and using a Q-Tip and some
Wood glue, reattach the 4 or 5 thin plastic strips
Which you removed previously, and space them
Evenly so that they hold the thin plastic
Retaining strip in place. If you broke a plastic
Strip during removal, take a thin piece of
Cardboard or cardstock, cut it to the approximate
Size, and use in lieu of the plastic strip.

When the glue has dried, reinstall the 7th and Dim
Chord Bass Button Rods, testing each one to
Make sure it operates freely.

When the final Bass Button Rods are installed,
Attach the outer thin retainer wood strip using the
Screws you removed. Test all the buttons to make
Sure they operate freely and make sure that all
The pieces you removed have been reinstalled.

You are done1! Reattach the bass mechanism
Cover plate, and the bass strap and you are ready
To enjoy!

By the way, a Great Children's Book about the
Accordion, with a music CD is available at:

Accordion Bass Mechanism Repair Part 3

Accordion Bass Mechanism Repair
Part 3

To remove the next set of 40 button rods
from the Minor and Major chords, you will
have to remove the plastic retainer strip
which separated the “Dim/7th” chord rods
from the “Min/Maj” chord rods. It is a very
thin plastic strip which rests in a slot that
runs the length of the guide which retains
these bass button rods. This retainer strip is
held in place by a series of four or five tiny
black plastic pieces which are glued in
place to keep this retainer strip from
popping out of it’s location.

You will have
to remove these tiny plastic pieces using
your jewelers screwdriver or a small sharp
chisel to pry them loose. Before you pry
them loose, cut a thin strip of masking tape
and stick it to the top of the strip you are
removing, so that when the strip comes
loose it won’t go flying but will be retained
by sticking to the tape. Then Pry loose.

If one of these
strips breaks, don’t worry. We’ll cover
how to make a replacement for it later on.
As you remove each plastic piece, take it
off of the tape, and put it in a baggie and
mark it. Once you have removed these
plastic pieces, gently pry the long thin
retainer strip up out of it’s slot, and wipe it
down with some “Goo be Gone” and place
it aside.

You are now ready to remove the Minor
and Major chord button rods. They follow
a similar procedure as just followed in Part 2


Rather than removing the Minor and Major
chord button rods as described above, you
can just remove them as an assembly by
loosening the wooden guide which holds them
as described below. If you choose this method


To remove the wooden guide
which holds the 80 bass button rods. It is
probably held in place by a screw at each
end on the top where the guide slides into a
slot in the wooden “stand off”. Remove
those screws, bag and identify them,
remove the wooden guide, and set it aside.

If you removed it as an assembly with the
bass button rods, lay the assembly on an
old towel and carefully remove the plastic
pieces and retaining strip as described above,
and remove the bass button rods one by one
cleaning them as you do, and placing them in
their correct location in the jig.

Follow a similar procedure for the Bass and
Counterbass button rods. More in Part 4.

Saturday, September 12, 2009

Accordion Bass Mechanism Repair Part 2

Accordion Bass Mechanism Repair Part 2

After you have built your jig to hold the
accordion bass button/rods, you can
proceed with the disassembly of the bass
mechanism. Before I start, I position the
accordion on a table, supported by a couple
of pillows, with the edge of the keyboard
away from me, and resting against some
sort of support to prevent it from slipping.

A couple of large spring clamps attached to
the edge of my table work well. You will
need a small jewelers screwdriver, and a
long nose pliers for this. If you can obtain a
“Bass Button Straightening Tool”, it may
come in handy to straighten any crooked
buttons. Also some masking tape, a pen or
pencil, a small straightedge, some cleaning
cloths, a bottle of “goo be gone”, some Q-
tips, and some small containers or baggies
for the screws you remove. A small
flashlight also comes in handy.

First, you must obviously disengage the
Bass Strap from the knurled adjusting nut
by spinning the nut until the threaded end is
free, and then moving the strap aside and
out of the way.

Then you must remove the
bass mechanism cover by removing the
appropriate screws. Make sure you mark
these screws and place them in a small
container in a safe location. Once the cover
is off you can see the Bass Mechanism

On older accordions there may be a
lot of dust and debris loose on the bottom. I
make sure there are no essential pieces
lying loose in there, and then I take my
vacuum cleaner and gently vacuum out any
obvious dust or debris. You may notice
“greasy” or “sticky” debris on the bass
button rods. Don’t worry about that now,
we will clean all of that up later.

The first set of Bass button rods you will
remove are the Diminished and 7th chords.
To do this you will have to remove the
“retainer” which holds them into their guide
slots at the bottom of the rods. Usually this
is a thin strip of wood held in place by four
small screws. Before you do anything,
mark the retainer with a pencil in some way
so that you know how to orient it when you
reinstall it. I usually put a letter “R” on the
right side.

Remove the screws, mark them
appropriately and place them in a small
container in a safe location. Remove the
retainer and set it aside.

Now the first set of rods is available for you
to begin to remove. Starting at the far right
side, with the bass button rods nearest the
air release button, remove the first rod by
gently sliding the bottom of the rod out of
the guide, and then gently lowering it until
the button is free of it’s hole up above.
Carefully withdraw the rod from the
accordion and being sure not to bend it.
These rods are made of aluminum and will
bend easily. Examine it for cleanliness and
straightness. Put a few drops of “Goo Be
Gone” on a cloth and clean the rod to
remove any grease or dust. Hold the rod up
against the small straightedge to see if it is
straight along it’s axis of movement. If it is
bowed at all, gently straighten it and then
place it into your jig in the appropriate
location. Follow the same procedure with
the remaining 39 bass buttons from the
Diminished and 7th chord locations.

More in Part 3.

Monday, September 7, 2009

Not For The Faint Hearted!

Disassembling an Accordion
Bass Mechanism
Part 1

If you’ve ever had an accordion that eventually
developed sticky bass buttons, or had bass buttons that
had “fallen into” the accordion, you may have
been intimidated, as I was,
about ever trying to fix the problem.
If you’ve ever ventured a peek into the
bass mechanism of the accordion, it looks like
something designed by a mad scientist.
How anyone ever conceived of all that “stuff”
I will never know. It is a very intricate
and complex thing that you just
don’t feel like tackling.
After reading John Reuther’s book on accordion
repair, and visiting several other websites,
I attempted my first bass mechanism repair on
an older, "fixer-upper."
It wasn’t really that difficult as long as
I followed a few very basic guidelines.
Before you begin, it is important to have
some way of keeping each individual bass
button/rod identified
and in the correct position so that when
you go to reassemble it, each piece
goes back into the same place
from which it was removed.
This is absolutely essential!
Some people recommend making a “jig”
or a device with 120 “holders” that mimic
the layout of the bass buttons,
so as you remove each button/rod,
you put it into a slot
that corresponds to it’s normally
installed location on the accordion.

When I started my first disassembly I noticed
that inside the accordion, the guides
for the 6 rows of 20 bass button rods
are actually arranged into 3 rows
of 40 Bass button rods.
That is to say, that starting from the
bass strap side, the diminished and 7ths chord
bass button rods are contained together in
a “guide” that holds those 40 rods.
Next, the minor and major chord bass
button rods are contained together in a
“guide” that holds those 40 rods.

Finally, the Bass and Counterbass button rods
are contained together in a “guide” that holds
those 40 rods.
So inside the accordion what you have are
three rows of 40 rods. Hence, I decided
to make a holder or “Bass Button Jig”
that had 3 rows of 40 holders.

I chose to use “Jumbo Plastic Straws” and
Cardboard to make my jig.

(Cardboard with 2 strips of double stick tape.)

(Straws stuck to double stick tape.)

I chose Jumbo Plastic Straws rather than regular
straws because my first jig used regular straws
and the fit was a bit too tight.
The jumbo straws give you some room
to play with.
There are a lot of different possibilities here,
but I was trying to do it on a budget.
I cut the straws into two and a half inch lengths,
and used double sided tape to hold 40 of those
straw segments between
two pieces of 2-1/2 inch wide cardboard.
Once I had three such sections made,
I attached them to a box and labeled one side
“Bellows Side”
and the other side
“Bass Strap Side.”

Once the jig is made, you are ready
to actually begin your disassembly.
More in Part 2, to come.