Has anyone repaired or replaced the three wheels on your power window regulators? Mine are not "free rolling" at all, the rest of the regulator is in good condition and works fine. The window is a little "bouncy" and I think it's because the wheels don't roll, they have plenty of grease on them and on the track. The felt in the channel is also in good condition and the window slides up & down with ease when working them by hand (regulator removed). Thanks in advance for any info you might have.