I have a question about the window screens in my '53 Clipper. Most of them are actually in OK shape but some have rips. How do I replace them? It looks like the center post with the opening levers is riveted and the screen goes between the metal strips on the inside and outside. I can't see how to fix this. I've got some galvanized steel insect screen from Vintage Trailer Supply on the way but now I am afraid it is all for nothing. Thanks for any guidance.