ive only been told lol, that you get a pipe mettal and spacers or washers that fit in side the tubing, you need 2 kindsa of washers/spacers, but thay both have to fit in the tubing. 1 needs a biger hole, 2 the outher type of washer needs a smallwer hole and put them in the pipein order of big hole small hole, untill you run oiut or are satified with eere your at. take wels the ends on and fit one end out with a screw type dealy with hole init and should be ok for you, hopw it makes sence and works if you give it a tey, if not sory to waist your time