Vulcan VN800A Petcock knob
thingiverse
My original one vibrated off somewhere between home and Canada because I forgot to loctite the screw. Mad with bike parts overall, I decided to make a quick replacement. The keyway is tight enough to where you don't really "need" a screw, but I'd advise one anyway. I put in a generic hole for a screw but I don't actually remember any details about the screw head itself. Use whatever thread pitch matches I guess. The keyway is 6x6mm with a 4.744mm radius (1mm arc height). May work for other carb bikes.
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