Easy to loose some skin on that one.
Although not a knife-maker I can relate.
Years ago I had a machine shop, with Landis tangential threading machines. I could thread and bend round bar up to 4" diameter.
Ground the "chasers" on an 8" grinder. Some thirty years later I still have the remnants of a "V" in my right thumb where it got caught between the guard and the wheel.
A beauty Ricky Bob.
Best,
GWB