I'm trying to fix up my side windows. Both rear windows have a lot of play when they are wound to the half way up position. By "play" I mean the windows rotate about 30 degrees around their forward bottom corners. Should the windows have so much play at this point? Do these windows rely on the rubber seals under the roof edging to guide them into the proper final position? If so, I will have to hurry up and replace them before I do more work on the winders! Cheers ... Greg