So the first thing off my new lathe is a 7.4mm x 0.5mm tap, for some of the delectable nib/feed units I recently acquired from PeteB. I can't pretend I'm a fully-fledged machinist now, but am I ever chuffed that it works! It's tool steel, so now I have to heat it up and quench it to harden it. Anyone done this before and got some tips?