OOcustoms I think you are confused on what a mandrel bender is. You will never find a mandrel bender for $500 they are more in the ranger of $20000 with little to no tooling. A mandrel bender does what the name implies it puts flexible mandrel inside the tube that flexes with the bend and keeps the tubing cross section round. The type of bender you are buying from Mitler brothers or the like is just a tubing bender with a follower shoe this keeps the bends consistent but you will notices at the start and stops of the bend the tube will have mark in it were the cross section of tube is out of round. If in had a mandrel inside it that goes away. Any way mandrel bender is not necessary to roll cage.
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Brian
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