I posted something that might have helped on the old site but I cant find it. Anyway, what I did was take some "small" binder clips that you can buy at the stationary store and took the arms off the springy thing. I bent the arms out to about a 45 degree angle, put the round part that will fit into the 3 notches in the glass into a vise, then bent the arms to about a 30 degree angle. The top edge ofthe arms fit intote rim like they where made for it. Adjust the 45 degree angle until the contraption snaps into place. That holds the glasss into the rim.
As far as gasketing goes, it's really easier to take a piece of rear window molding which is U shaped and wrap it around the lense. This seals the lense to the glass and to the bucket. Even for a trailer queen - nobody will know.
Shade tree mechanics know how to cheat!
Fat Fenders Forever.