Cadillac Repair: power window repair 89 Cadillac Deville, gm dealer, nut bolt

Question
Two years ago I had previous problem with power window not raising on the driver window.  The shop replaced a small broken plastic piece.  

This occurred again recently and i went to Cadillac and purchased the plastic "guide" and am attempting to replace myself.  I was able to pry the old guide off the regulator track that contains the window "tape".  I now cannot get the new piece back on the track.  It seems to be engineered to 'snap' on, but it is an insert-molded piece, consisting of plastic shape injection molded over a metal forming - so it has practically no flexure.  AFter an hour of wrestling with it, chewing up the plastic with pliars, and possible bending and deforming the track, I stopped.  It does easily slide over the end of track, but this approach does not allow to engage the "tape" with the guide teeth.  Thanks for any help you can give!  

Answer
Hi Tim, Here's the way it works. On one end is the plastic piece that fits on the end of the tape and slides into the window track. The way it is replaced is to release the tape at the other end by pulling or prying it off the 3 retaining tabs with a small flatblade screwdriver. Then hold the window switch in the down position so the tape end with the guide comes off the track. Then switch guides and push the up switch while guideing the tape and guide block onto the track. Then resnap the other end of the tape on the 3 plastic retaining nubs and then the guide can go into the glass track. You might need to drill out at least 2 of the window regulator rivets to allow to guide to flex enough to go into the track. Then use 1/4" nut/bolt/washers to reattach the regulator to the door. If you had access to the rivets and rivet gun then that is the easiest way to go it. Hope that helps. BTW if the tape is too chewed up it can be ordered or gotten from a GM dealer or try your local parts store so you don't have to replace the complete reguator. Bill