Window adjustment on a C4 cab

My drivers side window (when fully closed)is slightly too high to fit under the "channel" in the cabriolet top with the result that the glass gets pushed out and doesn't sit flush (read this and you know why they say a picture is worth a thousand words!).

Any ideas on how to adjust??
(1990 C4 Cab)

If you pull the door panel there is a slot that you can see the adjustment through. If you roll the window down to the right spot you'll see it. It's an allen head. Crack it loose and move the stop a little and retighten. Roll the window all the way up to check. Try this until it's perfect and you're done.