Harbor Freight Press Knob
thingiverse
I've printed a knob for my Harbor Freight 20-ton press relief valve, swapping out the stock stick for something more convenient. This custom knob can be printed in one piece or divided into two halves with alignment pins for easy assembly. The finished product is often smoother when printed in two parts. To join them, simply apply CA glue. The diameter of this knob measures approximately 50mm (2 inches) across. A threaded hole for a M4 x .7 set screw is included, and I was able to find suitable hardware at Ace Hardware.
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