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Dang Ryk, I never knew you were so freakishly smart.
He's from the North. 
The July 2013 (issue #58) of Rodz magazine (www.olskoolrodz.com) has a GREAT article titled "Product Evaluation: Broken Bolt Extractors".
They evaluated virtually EVERY type of extractor marketed, and as I already knew, DO NOT use the imported, cheap reverse spiral tapered extractors, or left-handed drill bits. They ONLY work when it's JUST A LITTLE too hard to grip the broken bit/bolt/screw.
"For small screws, the Micro-Grabits are the best choice."
"For larger bolts, ...the old standby Irwin Reverse Spiral, Pro Reverse Spiral, Reverse Serrated, and Drill-Outs all performed satisfactorily... Out of them, I'd rate the Drill-Outs top dog."
"For big stuff, try a common tool in the plumbing industry called an internal pipe wrench will work great."

And you may see me tonight
With an illegal smile
J. Prine
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