Clamping Knob For M8 Nut

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While preparing for a family trip the day after one of the clamping knobs for the cars rooftop bike rack cracked. While the clamping knob holds a regular M8 nut i could have just used a wrench to tighten it i but instead i decided to make a new one.This is a clamping knob which holds a M8 nut and can be used on a M8 threaded rod.This is what makes 3Dprinting so cool, being able to make your own spare parts.