Drawing compass with easy-to-use knob. Technically a remix of two designs from Thingiverse:

• [https://www.thingiverse.com/thing:4288633](https://www.thingiverse.com/thing:4288633) (scaled 102% with a larger pencil hole)
• [https://www.thingiverse.com/thing:5408177](https://www.thingiverse.com/thing:5408177) (specific settings applied)

It uses a few parts:

• 2x 14mm M4 pan head screws ([https://www.mcmaster.com/92005A223/](https://www.mcmaster.com/92005A223/))
• 2x M4 locknuts ([https://www.mcmaster.com/90631A112/](https://www.mcmaster.com/90631A112/))
• 1x 8mm M4 socket screw ([https://www.mcmaster.com/91292A108/](https://www.mcmaster.com/91292A108/))
• 1x M4 nut ([https://www.mcmaster.com/90591A141/](https://www.mcmaster.com/90591A141/)) 

I tighten the two screws with locknuts just tight enough that it moves slowly when adjusting, but does not move when drawing.