ORIGINAL: Glorfindel
Very simple. Just cut the bottle in 2 pieces and remove a 1/2inchs or whatever it takes to make it the correct lenght, use aeropoxy (hysol) to put it back together. Aeropoxy is kero proof. That's what i did on mine. I have a coke bottle cut down to 1.850litres. I can post you a pics if you want....
Interesting solution. For that matter, you could wrap the fuse with 6 ounce and resin probably.