Sent my old sashes out for install onto new smoked glass for my 52 Chevy 1/2 ton. Received them back with new glass passenger side up and running. Drivers side will only roll down halfway. Looking at the channel and it is being gouged by the sash, "what is the measurement" on each end of the sash and how can I move this glass the other direction approx. 1/8". Was thinking maybe some heat or maybe you guys or girls have experienced this problem. I am open to all suggestions, thanks HUGH