Very nice! As I always say "Finding complicated solutions is easy,
finding simple ones is hard". The plating makes it even nicer. Four
months is a bit long for the gestation, though. I'd suggest getting a
dog and taking it on walks in the woods. It's a great way to give your
mind time to mull over design problems.

A design question: why the third piece (the ring)? Why wasn't it
integral to the outer/turning piece?

Bob