On both my rear quarter windows the same 1 top roller has the same good slop I also have another extra set and they have the same slop ,so 4 sets of 1/4 windows with same exact slop on the same roller ,I am starting to think this is normal . And after doing some research on A body cars ,some had a spring and some didn't Is this spring what puts tension on this single roller with slop against the guide ? I did not have this spring on any of the 4 sets of 1/4 windows