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A guy in my neighborhood has a Model A. I didn't see him until today and I looked at his (he just bought it and didn't do any of the build, so asking him wouldn't really help).
It looks like you can remove the inside windshield molding, the lower kick panel and the dash panel to get to the back side where you can grind off the back of the rivets holding that strip in place. His has round top rivets holding that part of the windlace. I can't be sure that's the way it was done originally though. If yours looks to be held in the same way, that should do it.
A guy in my neighborhood has a Model A. I didn't see him until today and I looked at his (he just bought it and didn't do any of the build, so asking him wouldn't really help).
It looks like you can remove the inside windshield molding, the lower kick panel and the dash panel to get to the back side where you can grind off the back of the rivets holding that strip in place. His has round top rivets holding that part of the windlace. I can't be sure that's the way it was done originally though. If yours looks to be held in the same way, that should do it.