Hey everyone! Here is the problem, my front driver side seatbelt has some trouble retracting after use. It just flops around and takes a long time to retract. Recently, ive been having to feed it manually back into the little "slot" where is comes out of the side pillar, and after a while the tensioning mecheanism kicks in, but very slowly... so what is the problem? And is it a diy job? Thanks!