Dude, just peg the tube with a toothpick... Don't get all technical. Peg it and break off the toothpick at the opening of the tube. Hard mono will also jam it pretty solid, same deal, just cut it at the opening of the tube. There will be enough in there to hold the tube on. Apparently they also make silicone pegs which work even better, but I haven't used 'em much.