To the previous comments I would add that the thin pieces of paper or
plastic  be placed between the tracker bar's top and bottom few notes be
taped to a piece of thin cardboard that runs the width of the spool box
instead of taped to the thin board running back from the top of the
tracker bar.  The cardboard can be simply set in the spoolbox when you
want to play a reproducing roll and removed when you don't.  This way
the tape will never stain or remove the finish inside you spool box.

Dick Merchant