I’m getting pretty fed up with this.
I borrowed an inch tap and die kit from Ⅰ Yamasan yesterday, so I need to return it soon!
Our milling machine makes it really tough!
It’s so small that when you mount a circular cutter, you can barely move up and down ★
Using the circular cutter to work on the hex head (19 mm across flats)
60 degrees × 6 passes

Stepped to support the fork.
After chamfering a bit and cleaning it up, I apply hard anodizing
I’d like to say it’s done…