Seems like Tod has the right idea- weld one end shut, weld in a short piece of 1/8" pipe on the other end, then screw in a quick change air hose fitting. Get the whole thing nice and toasty in the forge, then inflate. Much like Elizabeth Brims pillows, I cant see why this wouldnt work. Ries Niemi Industrial Artist http://www.riesniemi.com/