I would suggest you don't bother repairing projections if a lot are
missing, but if the discs is a favourite you could send it to Lester
Jones in Chichester UK at Renaissance discs and he would copy it for
you, =L=1.50 (UK pounds) per inch of diameter.  His machine reads the
holes, not the projections, so if all are missing it does not matter.
The quality if new disc is excellent: over 100 different types now made.

Kevin McElhone
Archivist
Musical Box Society G.B.