Not Ranked
Richard Hudgins is pretty correct here. The structure the windshield is attached to is flexing but, what is causing it to flex is the question. This is due to the frame twisting you can watch a sign of this, if you will watch on most of these English roadster kit cars the gap in-between the door and the part of the body that is the top of the dash is changing as you drive down the road, especially during hard cornering or going over bumps in the road.
A stiffer chassis is the answer for this problem.
Roger
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