One Piece Windows

[cwilkie]

I purchased a kit of One Piece Windows for my 1968 Chevy and I am having a problem. I wanted them to work with some new aftermarket window regulators; however, there are some issues. The windows go in fine the trouble is when I try to roll them up. It starts to drag and I need to turn the handle a little harder. After a few times of doing this I broke a few teeth off the window regulator. I have been thinking about buying some power window regulators but I am unsure if I want to spend that much money on this window project. Has anyone had this problem? An advice is greatly appreciated.