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I had no problem backing my floor bolts out with a 1/2" drill geared well for good torque - I did have a 3/8" socket drive Phillips on an eighteen inch breaker bar to persuade them, a turn or two out then back in to let the drill have some time to get up RPMs; but most of them came out on the drill alone. It's all muscle memory.
The leverage advantage on the machine thread screws really doesn't care if the screw shaft is bent as little as they usually are when enough force is properly applied.
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