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i have the Bead Form tool. i learned about it from RRE about 10 years ago. mine has worked flawlessly since then. thank you RRE and Bead Form!!! IC pipes turn out perfect and it can be used for small sheet metal projects too (throat is a little short for any real sheet metal strengthening...)
also used one at PPE engineering for a couple years to do ALL of their FMIC pipes for 3000gts. my shoulder still aches from that (60 kit run 2 seperate times.. 6 steel pipes per kit with a bead rolled on each end!!!)
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I used one like the pic tim3kgt posted that I got from harbor freight years ago. I don't think it was that expensive and it worked great on my aluminum pipes. If you do use a roller like that it will make it a lot easier with 2 people---one to crank it and tighten it and the other the keep the pipe straight as it goes around.
I was doing some looking around for bead roller's, killing time really. Woodward Fab offers one that will do 1/8" beads, contacted them about different dies and they said no. There's is just under $300.
I also found this, seems to be more for plumbing, but seems like there are some other options. Large Tube Beading Tool, 3/4" 1" And Up, Free Shipping
Its a hand held or bench mounted tool. Seems like it could be interesting and only $150. Not sure if having it modified to use on 2.5-3" will increase the price.