Ghostbusters - Knob right side

Update 12th December 2019: I changed it slightly so you have enough space underneath if you use a potentiometer.

This is the black knob on the right side of the ghost trap from Ghostbusters (1984). When I was printing out the trap from Sean Charlesworth: https://www.thingiverse.com/thing:1394492 I reviewed the movie and realized that the knob is different from the knob Sean offers.

I added the holes for the set screws so you can either use the post from the trap mentioned above or a potentiometer.