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Joco,Can't do anything tonight as it's late here and my workshop is not at home but tomorrow I'll take a couple of pictures of some I made many, many years ago to my own design which makes the fixed screw far simpler to make and fit.AFAIK no one else has done it this way, everyone copies what has gone before.
That was one of the first projects I did when I got into this hobby. And by getting into this hobby, I mean I had no prior experience.I've used those clamps quite often. Very useful.Are you going to blacken them? I did. Pretty easy and I like how the clamps look and wear.
All I did was:1) pour some oil into a bread pan (might have been 2 1/2 or 3" deep)2) held the parts with wire3) heated to cheery red4) lowered parts (not too slowly) into oilBut recall what I'd said...I was a complete newbie at the time and I still don't complete understand the why's and consequences.