Hi all,I have a 1988 buick park ave. and I need to replace the drivers door window channel that the plastic window guide rides in,it looks like it may be riveted in Im not sure, the <new plastic guide> will not stay in,it pops out when I roll the window down,it gets about 3/4 of the way down and pops out in the same spot every time,and the rubber is torn up pretty bad, so what Im looking for is step by step directions on how to replace the window channel so I can get this ride back on the road..