I just worked on one of ours. There are little round "pucks" on the end of the scissor arms that ride in a track on the bottom of the window. When we tried to open one of our windows after winter storage, the window was stuck and my wife forced it. The "pucks popped out of the track. So, I basically went through the same process you would to replace the regulator. You simply slide one of the pucks in track from the end and then slide it all the way over to the other side of the window so you can get the puck in track on the opposite side. All you need to do now is pop rivet (or use small, short, nuts and bolts) the regulator to the frame. Took me about 10 minutes start to finish including clean up
Tim and Paula
2015 RW 39MB - Mor/ryde 8K IS with Kodiak Disc brakes. Goodyear G114s on 17.5 Rims. 420 watts Solar on roof, 440 amps of AGM batteries, 2000 watt Magnum inverter wired to sub panel.
2016 Ford F-350 DRW - B&W 20k OEM Companion hitch, Firestone Airbags