How 'bout a short tool making story.
Sometimes there's a SST for a job, but you just don't have time to go get one, or didn't know you needed it till you're in there. Take this for example, the preload screw in the top of the steering box sector shaft:
That screw freely rotates, but it's held in with that hex nut that's staked in place. Tried punching it out to no avail.
Measured the diameter of the hex with a set of calipers then picked out a sacrifical hex socket of the appropriate size. They're hardened, so you can't drill it easily. To anneal, all you have to do is heat it to as hot as you can get with a MAPP gas torch and let it cool to room temperature. I did that three times then punched a hole through. To restore hardness, I got the end as hot as I could and quenched it in some used motor oil I had:l
Worked like a charm. Thought the metallurgy part was neat. Use the anneal/harden technique to modify any kind of hardened steel tool you need.