I'm restoring a 68 and the door windows are apart. Ihave all the pieces but i don't know how they came apart . I need help

I'm restoring a 68 and the door windows are apart. Ihave all the pieces but i don't know how they came apart . I need help
ican help

do u have service manual for 68 chevys if not u must get one first of all then il need a fax number to send u my homemade directions i made when i changed mine i simplified it really nice easy to understand just come back give me a fax and ill send directions too u....its a snap

all the info is in the fisher body service manual for 68