SNIP
Joe

Sounds near impossible.  If this is the protractor head with the round part
that spins inside of the round cavity, I have a couple here I could hook you
up with.  One is in the box!

Ed Minch

END SNIP

Ed:

Very kind of you to offer, but I have two other functioning protractor heads
(yes that is the name, not compass).  This one was just a renovation
challenge.

Cheers!

Joe