Ive done one for a Gaggia - which was very simple because it bolts through.
I did one for a Silvia for a friend - the metal bits on this handle were just epoxied into a hole bored into the handle. I cant recall what it looked like - but I think it was a cross. Just bored to fit and poured in enough epoxy to fill and inserted...
That was about 4 years ago - still going strong.