Sorry if I've sent this idea in the past, or if it's been seen before. I found a relatively easy way to bead larger aluminum tubing when fabricating 'stuff' for fluids. I use a rivet squeezer with DIY dies. The male is made from a 3/16" bolt; the shaft wrapped with tape for a snug fit in the squeezer. Grind the head to a 1/2 cylinder shape, then round the ends to make a 'half blimp' shape. The female was made from an old female die by grinding a rounded trough across its face. I used the edge of the female die as my guide to align the bead ring around the end of the tube. (Keep watch on alignment; the dies can rotate.) 6061 T-6 is soft enough to do this, by taking small bites, going around the tube a couple of times to finish the bead. Not quite as deep as a 'factory' bead, but I'm pretty confident that it will be secure.