Hello all – the #1 Rolling Blocks I’ve fooled with (only 3 of them) have 12 TPI square threads. I think that is the standard #1 thread. I’ve got what was sold to me as a Swedish Rolling Block that was in 12.7X44R (I’ve since re-chambered to 50-70). The best I can measure these threads it looks like 20 TPI, but it’s a square thread….. not perfectly square, but more square than Vee.
Has anyone seen a Rolling Block with 20 TPI threads? Is it somewhat normal? Is this anything like normal?
Thanks to all for any info
Ken H>