it seems from observation not many coupe rear windows work. I have seen a lot of posts for regulators so I figured mine was on borrowed time. Since the air isnt particularly strong on this car I roll down all of the windows. 2 days ago the inevitable pop and the passenger side rear window drops down free. I was able to duct tape it up for a coupke days, confident I would not exceed the 200mph rating of the tape .
today I pulled off the cover and it looks like an easy fix. the pin that attaches the regulator popped off. I pulled the bottom cover plate off and gravity had taken care of the pin, straight down from the joint and stuck in a glob of lithium grease. I put the pin back on and the clip and ran it up again. then a cycled it a few times and pop, the clip comes off again. second time I had the window in a different position where it was easier to put the pin in with the little arm below the big arm. this time, to my amazement, the window went all the way down to the bottom of the opening. . since I never had a coupe before I thought half way was the complete travel. so I cycled and cycled it many many times and finally at half way down the little bar passed throught the bottom to the top, on the return down it jammed half way down. each of these cycles the little clip rubbed the big arm so I assume thats what finally causes it to let go. the way this mechanism works is that the tracks rock forward and back as the window goes up and down. this allows the window to follow a circular path and allows the window to go all the way past an area it could not in a stright path. when it flipped the little arm, the back and forth was not working right and it allowed enough movement for the little arm to turn all the way through.
so I cannot figure out how to insure the back and forth travel of the tracks. it seems dependant on the side load induced by the little arm as it gets closer to the big arm.
my solution is to drill a hole in the long arm and put a screw and nut that wont allow the little arm to pass behind the big arm. Has anyone ever done this? if so did it cause any issues? I looked at the motion of the arms and it looks like the stop would force the front to back track movement if it becomes stubborn. screw driver shows the point I would put the stop bolt.

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)