In response to Eliyahu Shahar:

Planning ahead: materials to ease removal of striking pneumatics.

I have encountered several different materials used as gaskets to ease
removal of pneumatics in future restorations.

Ampico used cheese cloth.  That seems to be the best choice, but I am
not sure how effective it is.  Some can be rather stubborn to remove.

Some Duo-Art striking pneumatics were applied with pouch leather.  I
have seen some that fell off and required re-gluing.

Others use packing leather for larger pneumatics. In these cases the
gaskets were not only glued, but screwed in place.  I think this is
acceptable; but when no screws are used, it is better not to use any
gaskets.

One person, thinking he was being thoughtful, used thin cardboard.  This
turned out to be a disaster, and nearly all of the pneumatics fell off
with light pressure, and caused more problems than if the cardboard had
not been used.

I think if I were restoring a player stack today, I would use hot glue
and not be concerned about sandwiching anything between the glue joint
to make it easier for future restoration.  Hot-glue joints are fairly
easy to break, using the correct tools.  Better to have them adhere
tightly than take a chance on having them fall off.

Seeburg was notorious for nearly impossible pneumatic removal, yet if
one is experienced in breaking these glue joints -- using a chisel the
same width of the pneumatic, laid perfectly parallel to the pneumatic
and given a sharp tap with a small hammer from each end -- the
pneumatics usually can be removed without much difficulty.  If they
break, they can be glued together or the bottom can easily be replaced. 
Placing the pneumatic in a freezing cold place overnight also can make
the job easier.  In my case, I have an unheated enclosed porch which, in
winter, is ideal for freezing glue joints.

Bruce Clark