When I'm out in the garage using the "Air Compressor" once I've finished for the day and I want to drain my "Bostitch pancake compressor" the round knob they put on it has just enough knurl to be seen, but not enough to be useful!

This gives you a better grip and you don't need to find a pair of pliers, too open or close the draincock!

Anet

A8

No

Yes

0.200

20

I used tree supports simply to keep the holes shape consistent.
Also, I used thicker walls, so the tap has something to bite into and not destroy the hole.

Items Needed:
two 1/4x20 - 1/2" set screws
1/4x20 Tap