Harbor Freight 20ton Press Knob

thingiverse

I designed a relief valve knob specifically for my Harbor Freight 20-ton shop press or 20-ton bottle jack. Frustrated with having to use the handle to release pressure on the hydraulic jack, I created this knob to fit snugly over the screw. For me, the fit is quite secure, so once I slipped the knob on, it remained very stable. If it starts to loosen up in the future, I'll probably just add a small drop of glue and reinstall it.