A knob for the Harbor Freight 20 ton press relief valve. I was tired of using the stick.
The Knob can be printed complete or in 2 halves with alignment pins. The finish is typically smoother on the 2 halves. You can CA glue it together.
Knob is 50mm diameter (approx. 2")
The set screw hole is a M4 x .7 threaded hole. I was able to find them at Ace hardware.