Hi,  You can buy the valve "pads", ready to glue on, from the
roller organ web site guy!  He has made a proper size punch so the
replacements are exactly the proper size and are very, very neat --
a much better looking job than trying to cut a set by hand.
Take a look at http://www.rollerorgans.com/Roller_Organ_History.htm

Enjoy your instrument.

Ken Vinen, Stratford, Ontario, Canada.

 [ The synthetic valve (pallet) seals are described at
 [ http://www.rollerorgans.com/Roller_Organ_Accessories.htm
 [ -- Robbie