Not finished; still missing some refinements - the screw is currently difficult to get in properly (needs perfect positioning).

My main reason for creating this was that I couldn't find one that had a threaded receptacle for the screw, made use of the D-type shaft and would fit within 27mm diameter.

Required Hardware:

• None, friction should suffice :)

Optional Hardware:

• (2) M3x12
• (1) M3x8
• (3) M3n OR: (2) M3n + (1) M3nS

Recommended Print settings:

• Layer height <0.25mm 
• Infill ≥15%