4" Cardboard Tube Plug

I needed to store some lengths of wood dowels, carbon fiber rods, steel rods, aluminum rods and music wire in a couple of cardboard tubes, and the flimsy plastic caps that were on them were falling apart, so made these up and they worked out qreat. They fit pretty tight, so i had to tap them in with a plastic mallet, so they aren't going to fall out.
I hope you find them useful.