[mass A man]

That rattle is the hinge rod that the top curl of the windshield frame swings on. It's worn and it is metal-to-metal there. Tightening the header screws isn't the answer. Do this; open the windshield about half way and secure it. Stand outside on the passenger side and grasp the side of the frame and wiggle it as you look closely at the top and you will see and hear the rattle you have. About the only painless way to fix it is to try and insert a piece of shim stock up and around the hinge and pray it doesn't fall out.