A superior tool over the available knobs for manual adjustment of your CR-10 Z Axis.
Will also work with Tevo Tornado and Prusa, any 8x8 4-start leadscrew really.
This crank is compatible with the cover plate for the Z Axis Manual Adjustment Knob https://www.thingiverse.com/thing:2534990 and included the file for it.
Finer is better obviously
Simply apply a bit of grease (not oil) to the bushing wall on the knob as well as the bushing surface of the nut and assemble.
I made tolerances on leadscrew threads very small for a tight fit, give even downward pressure while spinning and holding the stepper leadscrew adapter to prevent the screw from spinning. It should snug up very nicely and not come off through normal use.