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Construct a PCB according to the circuit shown below. Alternately, a hand-wired circuit may be simpler to construct with available parts. (Tekla Labs is working on converting this circuit diagram into a more accessible form and photographing the hand-wiring step-by-step.)

Drill a hole through the plastic casing to connect the speed control knob to the potentiometer.

Attach knob to potentiometer shaft outside of case