I'm trying to pull a window regulator out of the front drivers side door of my 1983 300SD. The window is up all the way. The window doesn't work. How am I supposed to undo the bolt? Its way up there and theres no room for any type of wrench that I have. Also how would I slide the glass out when its up all the way? Basically the motors blown and i have to switch the reglator motor. I'm having alot of trouble. Got any tips?