Ghostbusters - Knob right side
thingiverse
Update 12th December 2019: I tweaked it slightly to provide enough space underneath if you opt to use a potentiometer. This is the black knob on the right side of the ghost trap from Ghostbusters (1984). When printing out the trap from Sean Charlesworth, I reviewed the movie and noticed that the knob in the film differs significantly from the one offered by Sean on Thingiverse: https://www.thingiverse.com/thing:1394492. I added holes for set screws to enable you to either use the post from the mentioned trap or a potentiometer.
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