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I have broke my Craftsman line wrenches in various sizes over the years, but have never had an issue where I'm rounding nuts off from flex. Try some heat on the nuts if they are real stubborn or rusted in place.
Not to much heat depending on which line it is. I also have craftsman and a can of PB Blaster, my wrenches still look new.
My flare wrenches are cheapies from Harbor Freight. I have never had a problem with them. If a line is too tight for the flare wrench to loosen, I break out the vice grips, then replace the line, as the fittings are usually rusty.
My craftsman set easily removed A.I.R. tubes screwed into the exhaust manifold on my big block. They worked great with no "rounding/slippage." They are readily available. I'm sure MAC or Snap-on would be fine too. However, I have some cheap ones laying around I picked up somewhere years ago...and yes, they suck. Why I have never thrown them out is a complete mystery. Anyhow there is a big difference on the machining quality. Spend the cash and avoid the aggravation.
I've had a set of Craftsman flare nut wrenches for over 20 years. I have never had a problem with them. They are cheaper than Snap-on or MAC and are warranted forever.
I've got a set of craftsman that seem to work fine, also a few from a co. called easco that do the job. A friend has harbor freight set that are about soft as butter.I think that is Pittsburgh brand.
Just curious, do any of you ever check at pawn shops for tools?
I used to, but they were freakin' with their prices (on everything, including tools). I guess they make most of their $$$ on "loans" and if they get some sucker to purchase stuff off the shelf, that's just gravy...
I've had better luck (w/tools) at the local weekend swapmeets & occasional garage sale.