In article .com, brownnsharp
says...

Using the new bore dimensions, make a new quill. Make the quill with
steps in this order. First bore a through hole in a piece of steel
which is the root diameter of the thread at the back of the quill.
Thread the hole to match the screw.

Another approach is to leave the threading to the last, and then
bore the backside to accept a cylindrical bronze nut that is
pinnned in place. This makes the ram threads easily replacable,
and it separates the fabrication job into smaller bites.

Jim


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