CO: D shaft clip

Mine is a bent over piece of spring steel shim stock. Dont want to take a chance on breaking it by digging it out of the knob for a pic. An alternative would be to do what they did on the 67 wiper knobs. Drill in on the side of the knob where the flat side of the switch shaft meets the spring steel retainer, tap the hole, and install a small set screw like used on heater control slider knobs.