Hi, yesterday after lowering my drivers window it would not come back up. After stripping it down this morning I found one of the bars had snapped, so another mechanism was sourced and after a fifty mile round trip the new one purchased and was fitted as soon as I got home only to find it stops about an inch from the top and starts ratcheting. Am I to believe that there is a way to adjust the mechanism or is the one I bought also faulty ?