RE: 2011 project
Nope, not a plug, just a form.
I normally fiberglass the inside of my fuses, and when I do it flat, they tend to stress fracture when I bend them to get the formers in.
This way I can glass them and add the 1/64 doubler, put the cut out piece on top of the fuse side, add a little weight, and when its dry I'll have a perfectly shaped fuse side with the exact fuse curve already there. Unfortunately, my band saw isn't up to the task of accurately cutting the 4"x4". The neighbor has one he said I could borrow, but its gotta warm up at least a little bit. First the snow dump, now the cold... Brrr...
Actually going to use Carbon Fiber Veil on the inside of these instead of Glass, I'll let you know how it goes.