Ask the experts, Very stiff manual window

[carwasher]

My 66 c10 has a very stiff drivers side window, It had the regulator and window felt/rubber replaced, before I brought it. I tried to adjust with vent window guide no good. So I purchased new regulator and all window rubbers from brothers. (my thinking was wrong reg or rubbers). I replaced the reg. and the rubber that runs along the top of window channel. Its better but still very stiff. All the wheel tracks are in very good shape. The vent window channel still has the original, so if I put new in ,I think it will make things worst. One question is do all 1966 windows have a metal frame around it? I keep thinking the rubbers/felt is to tight on the metal frames. All the rubbers came in Precision packaging. which I believe is good stuff.

Thanks in advance for ANY help
Jim