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FWIW: When I bent 1" copper pipe for my motorhome generator exhaust, the bender would crimp it, but I moved the bender a half inch or so every time it started to crip, so I ended up with a lot of very minor crimps, rather than one big nasty crimp.
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'95 F150 XL, 2wd, 300 I6, 5 speed, 3.08 gear, 151,000+ miles, Flowtech Raptor muffler, driven hard for fun!
'92 Aerostar 3.0 Vulcan V6, auto, 133,000+ miles, Dynomax Super Turbo muffler
www.HonestEdu.org
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