I recently had a flat on my back tire. I fixed it, but I guess I didn't get the nuts tight enough and the axle spun. I took the motor apart and all of the wires were still connected. So I put it back together and put it back on the bike. I did not connect the battery. I tried spinning it with my hand, but I could only turn it (not spin it) when I used considerable force. Does anyone know how I should proceed?