I'm working on my '67 coupe, and it's the first time I've been into the quarter window setup on a '67. The riveted on rollers on the quarter window frame are slightly different than what I've seen with '65-66 quarter windows. One of my 3 rollers on this '67 window rolls freely, but the other two are very tight. Which way is correct? I would think they would all roll as the window moved up and down in the track, but I saw that wave washer behind them (seems to be holding tension on them), and wanted to ask to be sure.