Noticed my rear windows were slightly loose today so set about tightening them up. Firstly tried from the inside, no luck as the whole assembly rotates, so gently removed the outer plastic covers. Got them tightened up, but an I fook get the covers refitted. They are really tight & due to the concave shape will not squash back over. Have tried using some silicone liquid grease but still cannot get them back over the 4 small lugs which hold them on.

Any ideas.....