Ah yes. The ravages of time... Scott, these are on my parts list. It's a bit of a bummer to need these as I am so concerned with the big ticket interior and engine items. Just as visible and harder to find. I tried pulling the gasket out and disassembling these. HAH! Looks like one screw holding the horizontal bar in place and the rest is crimp style riviets??? Ugh. The base frame of the wing window is the first to go rusting. Mine are peppered. The frames are not so great. I think I will check in with Mike at B/E&A...