I have vinyl replacement windows. Last night I went to close a window and when I pulled down on the finger grab on the bottom sash rail, the rail pulled away from the glass. It didn't want to pop back into place with hand pressure. What holds these sash frames to the glass? (The corners didn't separate. Only the center of the 4' span of the sash frame dipped down--and far enough that I can't close the sash enough to lock it.)

Once upon a time, someone installed cut pieces of plywood over the outside of the aluminum windows for hurricane protection and used self tapping screws. Later on they removed the plywood pieces and backed out the screws. Some of the screws broke off. So each window has about a dozen drilled holes about 1/8" in diameter. How would you patch these holes? Exterior sparkling compound? Caulk? Polyurethane sealant? White epoxy? Something else? Furthermore, one of the screws that broke off while being backed out is stuck and deformed the aluminum. Now, years later, is rusted. Any idea how to get it out? An angle grinder would be too aggressive? May be a dremel with a cutoff wheel will cut the protruding part flush? No way to extract the broken piece without further bending the aluminum?