Well then you need spacer nuts basically one will go behind your break thing onto where the bearing is itself there should be a washer between it and the bearing and on the other side next to your sprocket there should be another one and those should B doubled so that it can't back off then on the sprocket side you tighten the end so it has clearance and lines up with the motor tighten it down and then go to the break side and tighten that the same way.