Originally Posted by Rich05  5/8" stainless steel rod with 1/8" allen wrench |
Your first post read;
I need to cut a small square or hex pocket in the inside of a 9mm shaft, so the shaft can be held with an allen wrench.
5/8" is a lot bigger than 9mm and makes the problem trivial.
Get some 8-32 socket head stainless steel cap screws.
Cut the heads off.
Bore a hole slightly smaller than the head in the end of the shaft; if you look at the head you will see they are knurled and have a smooth ring, make the hole about the size of this ring.
Push the head into the hole.