I lost my 16s D shaped stud while changing a broken spring with a new Elinvar that was not fitted with a stud. Actually I removed it because it was not D shaped.
Many new springs on offer wont have a stud………
I looked on Esslinger and Cousins but can’t narrow down it so well.

Can someOne recommend where I can source a few D shaped studs for my Illinois 16s 163A?
Or any compatible D stud for that type balance cock.
Regards, james