Coffee Grinder Handle

The shaft on my coffee grinder started to wear of due to the flat crank handle with small surface area; therefore I was looking for a crank handle replacement. I remixed an existing design of the rotary crank handle to improve upon its several shortcomings.

###Improvements###

* Metal screw is added to the knob to improve robustness
* teflon tube is mounted on the screw to minimize friction
* contact surface area at the pentagonal shaft is maximized

###List of materials###

1. truss head M4x30mm screw
2. M4 washer
3. M4 nut
4. teflon tube OD 4mm, ID 3mm, cut to 9mm length
5. 3d printed knob
6. 3d printed crank

###Notes###

A smaller teflon tube is used used intentionally to get a tight fit on the M4 screw. First, I screwed a teflon tube on the screw gently using pliers and then cut it down to required length.