scope adjustment knobs

this is my scope adjustment knob, it is a one pieced design so some thin supports are needed and should be "broken" after printing.
For the short knob the coin should be cutted in half.
A one cent coin should be added inside wich will make the adjustment rotate.
The knob adjusts by preassure so a bit of teflon tape should be added to the thread to make it fit perfectly, i know it would be better with a thread in the design but the scope one is very week.