you can do it w/o any glue.... all you have to do is cut a hole that is smaller than the tube and cut the end of the tube at an angle to make a point and put the point through the cap and then use pliars to pull it all the way through.... that wasnt my idea, but thats what i do... and i forgot who said it, but i hear dit on this board.... and soda bottle work the best because they are made to resist the pressure....