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Originally Posted by Dillon Compton
Is the oblong roller necessary as well, or could one do something more along the lines of an AM trick wheel with the roller at a 45* angle?
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The shape of the angled roller is intended to make the overall profile of the wheel a smooth circle. If that's not done, the wheel will be somewhat "bouncy" in operation, and it won't have consistent traction as it turns. If the inconsistency is severe enough, it will be difficult to maintain a desired direction of travel.