I think it should be mentioned that there are plastic keytops, and then,
there are *Plastic Keytops*! Most new key jobs will be with plastic
keytops, because ivory is very expensive. Both styles have to be fitted
properly to look good. The tops with the rounded edges and the sharp
mold line under the front of the key, in my opinion just look awful.
I agree with Bruce Clark completely!
On the other hand, you can't really say "Ugh! Oh how awful" when you see
a new Steinway or Yamaha, either. It is an absolutely gorgeous, inviting
keyboard that just says, "play me." That is the kind of keytop to buy
when you are not trying to match an original keyboard sometime. Those
tops are never quarter-rounded, but are one-piece tops having the front
molded on with a beveled edge and no mold-line.
When installing these kinds of keys, the original celluloid fronts should
be removed, the key trimmed down to the correct new height, and the new
plastic one-piece top installed with acrylic cement, only. *DO NOT use
contact cement or rubber cement. They will all fall off if you do!
I don't know of any great musician who objects to having a professionally
fitted plastic key set, and by far, most of them _prefer_ acrylic to
ivory. There is less chance of an accident during a performance. (That's
when ivory flies off, on occasion -- tusk,tusk!)