cutlass window help

The driver side window on my 83 cutlass needs adjusting, it is not fitting in the roof rail seal properly. The guy who tinted my windows said the mechanism in the door is worn out and needs replacing. I was wondering if i can adjust the window without replacing all that stuff. I noticed the window is held in by rubber stoppers, can i just loosen those and adjust the window that way or should i not do that? Thanks for any help.