Tevo Tornado Z axis knob

This is a knob i designed to go on the top of the z axis of the tevo tornado to manually adjust the height. Because i have installed a new coupling to get rid of the flex that happens with the stock coupling my z axis screw sticks out of the top just enough to get a knob on it. you can get these couplings for less then $5 and it helps get a more accurate layer height.

Link for the coupling i am using for the Z axis:
https://www.banggood.com/5mm-x-8mm-Aluminum-Flexible-Spider-Shaft-Co