I need a cassette locking ring tool that will fit over the 12mm spindle of my AKM100 hub motor. Most seem to have a central guide pin, others seem to have too narrow an aperture.
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Edit
Just had a look through my tools and I have one the same as above and it fits fine over the motor axle.
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this one also works well for larger axles like 14mm
your meant to use it against the frame and pedal force but using grips on it works though abit awkward