Hey guys, I had some small pieces of motorcycle visor left over from my last spartan helmet, and they are just a percfect fit for the eye pieces in a Space Marine helmet I am building. They need to have a slight cuve on them, however, and I was wondering if I put them in a clamp and heated them with a heat gun, would they retain their shape? to the best of my knowlege, they are made from polycarbonate plastic. Any help is appreciated. Thanks!