for pipe you can get or copy the Harbor Freight dies.
1950 F1 street rod
1949 F1 stock V8 flathead
1948 F6 350 chevy/rest stock, no dump bed
1953 chevy 3100 AD for 85 S10 frame going for a 4BT cummins motor, NV4500
1968 Baha Bug with 2.2 ecotec motor, king coil-overs,P/S
2000 National Sea Breeze 5th wheel trailer
1998.5 Dodge 2500 4x4 Cummins,
30+ years ago I helped design the Hydrabend exhaust pipe bender which was similar to the Hooth and Worth benders with several exceptions I believe that Ben-Pac now sells a bender almost identical to the one we built. these are what are termed as twin gate benders where the die and tube or pipe is forced between 2 gates forcing them open. We tested each and every bender we made with 2 1/2" sch 80 black seamless pipe. Our large model had a single gate which revolved around the fixed die much like a hand held brake tubing bender. On these we offered a system by which a mandrel ball could be inserted in the tube or pipe allowing a much tighter bend radius. in the case of annealed 1020 DOM tubing a bend radius as tight as 1.75 x the diameter could be achieved.
The biggest problem with the Harbor Freight style pipe benders is the 2 rollers on either side of the die those should be replaced with bar type dies that have machined groves the diameter of the pipe or tubing being bent theit lengths should be at least 3 times the diameter of the work piece and hardened
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