We now sell hex keys for the small and medium knob sizes, the small knobs use a very small imperial sized key for which there isn’t a good metric alternative (0.05 inch). Please take care using this key and don’t use excessive force to over-tighten the screws, due to the very small diameter it is quite easy to blunt the key.
These RB range knobs are made in the USA by Rogan and have been frequently used by Verbos Electronics as well as on Buchla systems. They feel great to touch, and look fantastic on all types of panels. These 6.35mm knobs are made with ABS plastic with a matte finish, and will fit perfectly on our Alpha 9mm Pots.
Note: these knobs use bushings and set screw(s) – they require a small hex-key rather than a screwdriver to tighten them.