Armrest for Gray Research 212 Tonearm

Hello friends!
I have been recovering my Gray Research 212 tonearm for a long time.
Faced some problems, but still managed to solve some of them.
At the moment, I need an armrest, unfortunately, I cannot purchase it, and I made a decision to recreate it on a lathe. I ask you, if anyone has this armrest at hand, publish the dimensions. Thank you in advance!
Cheers!