Windshield header nut spinning

[derb]

Not the best description but...
When reinstalling the driver's side sun visor one of the nuts that are pressed in to the header came loose and now one screw is partially screwed in.
I found a page on Mike Focke's website that describes how to replace the brass nuts with nutserts but I need to remove the screw first. I tried prying the screw to put pressure on the nut to hold it enough to back the screw out but that didn't work.
Thought about drilling a hole in the header so I could use something to hold the loose nut but figured I'd post here and tap the vast knowledge of this forum.
Any advice is greatly appreciated.

Regards,
mike