Michael Pawelek asks about removing the holding pins in a Rolmonica.
On my examples of the standard and chromatic Rolmonicas, the pins have
small knob heads.  Using a small, stiff, but sharp, knife blade (e.g.
a pen-knife) I can ease the pins out enough to then grip them with
pliers.

Alternatively, a small pair of nail pulling pincers, carefully sharpened
to go under the heads, might work (but don't grip hard enough to chop
off the heads!).  Of course, these may not be original pins on mine;
I don't know for sure.

John Farmer
Worcestershire
UK