My dad has one that he bought about 15 years ago from Williams lo-buck Tools. like the JD squared bender mentioned above this one is manual but can be fitted with a hydraulic ram. They offer 90 or 120 degree mandrels and it also does a beautiful job with absolutely no crimping or wrinkling.
I don't even know if Williams Lo-Buck is still in business but if so their benders are top notch and pretty economical.
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