Shortening plastic key tops

[Alan Forsyth]

Stéphane Collin wrote;
"This might seem a stupid question, but what machine do you use for
machining plastic keytops ?  When I try this at home, plastic melts and
makes a mess."

I use just a plain very sharp hand chisel. Plastic is very easy to
plane/chisel. One thing I don't understand though is why you would want to
shorten key tops from the front. I shorten them from the rear, saving all
that hassle of shaping the front edge.

AF