Those that followe RCM closely may know I upgraded my CNC mill with a
ballscrew on the knee...

The whole idea here was to enter a tool number (M6 T##) and have the
knee automatically move to the correct tool height. This week I'm
putting the 30 or so toolholders through the height guage and setting
up the tool table.

OK, what's the best way to semi permantly mark each tool holder. I
don't want to stamp or etch the holders. i tried electrical wire
numbers and they fly right off. other ideas? Is there a permanent
paint marker that takes coolant maybe?

Karl