In article , Clark Magnuson says...

I have a 2" long, 1/4" square Cobalt tool bit I have ground for cutting
internal threads with a boring bar.
The bit is too long to fit in the hole in the work.

1) notch one side of the tool all the way across, 1/16 or so deep.
A v-notch works best

2) place the tool in your vise, sticking straight up, with the
notch towards you.

3) cover with a rag

4) smack the tool with a brass hammer, away from you.

Jim


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