Bottle jack knob
thingiverse
This is a custom knob designed specifically for 4 ton harbor freight bottle jacks to facilitate effortless lift and lower rotation. It may also work seamlessly with similar jacks on the market. One of the product images showcases detailed coupler dimensions in inches for easy reference. I 3D printed this part using PETG with a 100% fill density, resulting in a snug fit that works remarkably well. While a harder filament might provide an even more precise fit, the current design has proven to be fully functional and reliable.
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