Hi everyone. First post, having just recently bought a 13/60 ........... the drivers window won't wind down the last few inches. Looking at the mechanism, the regulator reaches the end of it's slot in the channel one one side - and will go no further. Is this an adjustment thing, or is it wrongly fitted? I reckon the window would have to come out so that the channel can be relocated, but I might be over-complicating! Thanks.