yeh, I use a heat gun at low setting with a concentrator nozzle like Flyborg said. welding kits including tubing etc are available at a number of flyshops now, many include instructions. If there's no strings containing links on this forum, there's a forum having to do with Spey (which shall remain nameless) where there are loopwelding strings roaring almost constantly and have links to suppliers. Or PM me. It is fun too... me and a buddy got together recently when our home waters were blown out and spent an afternoon welding loops and making customized scando heads, and repairing some of our lines. then went down for some trycasting and went back to finetune some more. Many loops are hard to distinguish from a factory loop, that's how good you can get them.