Locking knob for Swagman bike rack
thingiverse
For a bike rack mounted on a car roof. In particular, this [Swagman Upright bike rack](https://www.amazon.com/Swagman-Upright-Roof-Mount-Bike/dp/B000SL1AEG). Fits any M8 nut (12 mm across flats). Provides a high torque, low speed section & a low torque, high speed section too. We lost the key to the original knob, so we disassembled it to get the nut & now just use this.
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