The manual says to use the provided key and turn the locks, I don't have the key but it appears that a screw driver should work, but when I put a screw driver into the slot and turn in the correct direction it doesn't work, with my other hand I can feel the latch start to move so it isn't frozen. Does the provided key do something else inside the slot? If so what device can I use to turn it? BTW, I didn't think I'd be removing it because I bought a new Vette and removed the tops and the rear window before I drove it off the showroom floor, that was the last time I ever took the rear window out. In the case of the RT/10 the rear window has a dark film on it, looks great on a black car but with the top off it creates a mirror when I look through in the rear view mirror, I've already installed a 360° camera system but that doesn't help either because of the glare on the monitor. Looks like when you remove the top you have to remove the rear window too because of the glare (or remove the film).