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I've used this bender on stainless brake lines and it was just OK. Just couldn't make tight radius bends without kinks.
A rolling bender sold by Eastwood gave me 1" radius 180 degree kink free bends.
Tubing Bender Rolling
Rolling Cam Tubing Benders
Here are two essential tools when forming coated tubing. For smaller diameter (3/16"and 1/4" O.D.)coated tubing, use the 49041 Rolling Action Tubing Bender. It produces distortion free, uniform, tight, 180 ° bends down to a 1"radius. Will not harm protective surface coatings on fuel and brake lines. A free rolling follower cam minimizes distortion and stretching. Comes apart for easy placement over long pieces of tubing. For bench use, a tab is provided on the lower handle. For larger diameter tubing (5/6" and 3/8"O.D.), use the Heavy Duty Tubing ender, which will bend thick walled tubing easily. Also comes apart for easy placement over long pieces of tubing. Same free rolling follower cam principle as the smaller bender minimizes stretching and distortion.
You have to calculate in with your final measurements bend ratio. On 3/8 I believes its close to 1/2 inch. So if you measure a bend to another bend you have to subtract aproximately 1/2 inch to compensate for the additional distance the bend creates....or something like that
Xakk -
Seriously, you need to throw that tube bender over the fence to your neighbor's yard and go buy a real tube bender. That's not a real tube bender.
It will not happen with a quality bender. And a so-called universal bend everything bender is absolute garbage. You need exact size benders. Try Mac or Snap on. But they are pricy, except they WORK.