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While leafing through my “Ideas for TM Posts” file, I found a page I had cut from the Feb. 2009 issue of Popular Mechanics that mentioned the Klenk DA86450 Select-A-Bit™. It’s a ratcheting screwdriver with a 4:1 gearing produced by holding the nose piece (which causes the bit to turn four times for each single turn of the handle). The 4:1 option is for driving screws and nuts in low-torque applications; the 1:1 ratio is recommended for higher-torque.

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