[Dominik]

Ok David.

As for you stud, I agree, having used a similar version for my Contemporary rear hub in 1993. They were screwed straight into the hub as the ones from ERA (?). Made from "tool" steel (can't remember the specs)

I found measurements from Wheelcraft. Their hole diameter is 19.7mm =.775" (!), depth varies from 11/16" to 1 1/4", which is a problem.

LMH's 1-3/16" sounds feasible. That length sounds familiar to my TRIGOs once.

You should ask at SPF and the other big manufacturers to confirm nut lengths and taper angle of the adapter. The adapter is typically 3/8" thick.

Dom