On Dec 7, 4:56*pm, Bob Engelhardt wrote:
...He takes a piece of mild steel
round stock, drills a hole that's an interference fit for a 1/8" Allen
key, presses a piece of the key in, and forges the stock to fit the key.
...
Bob

If you can forge steel, maybe you could flatten and round the head of
a Grade 5 bolt and make the round-square punch for the hole out of
key stock. To clean up and size the hole clamp the wrench in a vise
and use the jaws as a filing guide.

I use old Armstrong square wrenches on the lathe, keeping everything
close to original, otherwise 8 point sockets. You can use them to
connect and compare two torque wrenches.

jsw