Taprite regulator knob

UPDATE2: The Loctite eventually loosened up on one of the knobs so I redesigned the knob to have a small rib on the inside to match up with the screw slot in the regulator screw. This was the original design but I found it was too difficult to get the knob pressed onto the screw head while trying to keep the rib and slot aligned so went without the rib. The filament I currently have shrinks quite a bit more than the original stuff so I needed to hand-fit the knob anyway by scraping it with the edge of a drill bit. I've added the model with the rib in the knob3_rib file

UPDATE: I had one of these knobs loosen up after a few months. I wiggled the knob off the screw head and added a couple drops of Locktite thread locker to the inside of the knob and pressed it back on. Seems to have snugged it up