Hi, i just bought a second hand cyclamatic power plus e bike, i noticed the rear wheel spokes were loose, i tightened the spokes up(never done this before) and i guess i over tightened them, i turned my throttle and the rear hub made a strange noise,now the wheel will not revolve with the throttle, i now do not know what to do, im about the take off my rear wheel to see what the problem is, is there any hints or tips of what i should do to solve my problem, im new to this so please can anyone advise me on what to do, thanks so much in advance,