A simple knurled knob replacement for a Patton 20" fan. Likely works on many more switches and potentiometers. Shaft is a split double-flat style. Detent marker is parallel to flats. Print with base down.

Key Dimensions

Knurled OD: 30mm
Knob OD: 36mm
Shaft OD: 6.5mm
Shaft Flat Length: 10.4mm (knob takes up to 16mm)
Shaft Flat-to-Flat: 5.4mm