[Radioroslyn]

I did some nosing around and found that the original caps were 4 3/4" long x 1 5/16" in dia. Guess what 1" pvc pipe fits the bill at 1.315" od. Sometimes you can find some short pieces at the store for cheep. A good sanding to breakdown the slick finish on the outside will help the silver paint stick. Primer helps even more it's made for pvc stuff. A couple of end caps and something for the bottom. You could use hot glue to hold it in place (the bottom cap). That's if you want to go this route...

The last time Mershon caps were used in Philco chassis was in the 1931/32. So, you wouldn't really find copper caps in the 89/19 models. For what it's worth.