To replace the keytops is simple.  The supply company has plastic or
ebony sharps.  They are very inexpensive.  Installing them is tricky,
as sometimes the sharp overhangs the wood below and you will have to
get them all the same to line up and not hit the notch in the natural
keytops.

D.L. Bullock    St. Louis
http://www.thepianoworld.com/