Phoenix8990

The rear 1/4 windows on my 69 Vert rock in the tracks. If I take the top corner it will rock back and forth about an inch or so. The regulator is fine and all rollers are in place. I watched some Youtube videos on them and most guys seemed to just clean everything up and reassemble them. I had purchased a kit from Partsplace with all new rollers etc, but after the video I began to wonder if this is normal. All nylon rollers and track seem to look fine. Any suggestions?
thanks,
Steve