Posting in DIY, but this is work and the machine and tooling belongs to the capitalist who pays me for my labor. I "did it myself" though.

We needed to add through-coolant slots to some milling tool holders, and... this is what I came up with. The longer you look at it, the more awful it is. At least, the wire EDM doesn't apply any torque to the workpiece. A mill would obliterate this house of cards.