Trying to get cadence sensor/magnet attached to this crank if i use the first 12 pole magnet and place behind the nut there is no thread left to put the nut back on, if i place it on this side of the nut i can't get it to sit properly has a major wobble so the sensor would only pick up maybe half the disc. The other one if i cut it in half is thinner and would probably be ok behind the nut but i think the diameter is to small as the sensor would need to fit to the frame. Is there a solution i am not seeing or is there another type of cadence sensor for this type of crank?