[mr bruce]

That Harbor Freight bender is basically a conduit bender. You need a real follow bar bender to bend mild steet tubing.Like the one from Pro-tools,(813-986-9000) A mandrel bender has mandrels that fit inside the tubing, to keep wall thickness consistent.Watch out where you get your tubing too. Lots of the stuff out of Canada wont pass tech because of inconsistent wall thickness.Most racing.series use sonic testers to check roll bar thickness now .What kind of car you got?By the time you buy everything to do a one off project ,you'll probably be way ahead cash wise to buy an already built cage.