I didn't even know this thing existed until yesterday. I'm hoping that it helps me bust these two J35A3 crank bolts off that I have. I don't have any of my air tools up here in Denton, so the duties fall to my Makita 1/2-impact. It's good, but so far not good enough to do stuck on crankshaft bolts.
The theory behind this is the additional mass acting on the sides of the bolt head and not being lost to resonance. There is a guy with a demonstrational video in the review section on the product page that shows the bolt coming right off after failed attempts with a standard 19mm impact socket. That's assurance enough for me.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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