Yamaha XT225 Petcock Knob
thingiverse
Made specifically for my Yamaha XT225 gas petcock. Created from memory, so it's not an exact duplicate. Close enough is acceptable. The central pole measures 7mm in overall diameter and 40mm in length. A precise center hole of 7.2mm was modeled to ensure proper clearances. To provide additional support for the screw, I added a 9mm washer. (Consider commenting if it still functions without this washer) This design could be adapted for use with other D-shaped knobs as well.
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