Filter switch module

Long piece of wood (9 x 3 x 1.1cm)
Small piece of wood (1.7 x 3 x 1.1cm)
Bamboo struts (5 x 0.9 x 0.25cm)
8 small boring screws
4 small screws to fit perfboard, and 8 fitting nuts
Filter switch circuit
Control knob (SCI RN-99E(Ø6.4mm) Control Knob-Black/Silver Cap-White Line-6.4mm Shaft 22.9mm)

Side view of filter switch module

Top view of filter switch module

Under view of filter switch module

Short side view of filter switch module

Drill small holes into top of small piece of wood to allow unused connectors of rotary switch to slot firmly into place.
Drill a large hole in the long piece of wood to allow the rotary switch shaft to poke through, aligned so the rotary switch and wood are towards one side, but do not poke out beyond the wood.
Drill small holes into underside of the long piece of wood, aligning with the perf board. Use the screws and nuts to secure it into position.
Attach the small piece of wood to the long piece of wood using the bamboo struts and boring screws, drilling holes to prevent you from splitting either the struts or the wood.
Secure the control knob on top of the rotary switch, so its indicator line points turns along the long side of the long piece of wood (e.g. between 6 and 11 o’clock)