How do I prevent someone from turning the 230 Micro Pump adjustment knob?

The adjustment knob on a 230 Micro Pump can be locked into place by using a 1/16” allen wrench to tighten the set screw on the adjustment knob. Tighten the screw ~1/2 to 3/4 of a turn (clockwise) until it bottoms out, but do not over tighten as overtightening may strip the threads or cause damage to the internals of the adjustment knob. If the adjustment knob needs to be turned, loosen the set screw ~1/2 to 3/4 of a turn counterclockwise. Backing the set screw out too far could allow the adjustment knob to fully thread apart.