Tools for beading alum pipe for turbo, ic and cooling piping are expensive for the good stuff. I searched around and built several kinds and the best by far uses a modified HD
crimp tool from HF or many other parts stores.






I cut the end off that cuts wire so I had left just the crimp part. If you use just like that you put on good bead but the end of tube is reduced in diameter a little
by tool. If you look at picture of tool, see the red dot which is where I filed/ground out a relief on one side so that you get a nice crimp w/o affecting the diameter.
You crimp, move a little just overlapping until you have ground around tube. Even a 3 " tube just takes a couple min and because you slide tube into tool till it bottoms, the crimp is even
all the way around and is nice and smooth for your tubing to slip over.