Leave Rear glass window in or unzipped and down Conv. top?

Hello,
I just had some work done and they zipped up my rear window to my top. A real pain!
So he say's just put the top down and leave the window in. So I asked another guy, he says unzip the window every time?
Anybody know the correct way??
Thanks in advance. I would hate to brake the rear window!
Steve


depends on the car. in the later ones I think it says to leave the "glass" backlight zipped. in my 66 dart since it's plastic it says unzip it first.
convertible lowering procedure.jpg