We also bought a Harbor Freight screwdriver just like that one when we were testing our designs, we ultimately decided not to use it because the Black and Decker had a larger reduction and the transmission had a much better build quality (we could hear the Harbor Freight screwdriver skipping teeth when we stopped the output shaft) the Black and Decker ones are also the same price.
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I can literally just pull the pinion off this bad boy and press it onto our RS395
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Neither the Harbor Freight or the B&D screwdrivers had pressed on pinions, they just had flats in the shafts, which was easy to replicate with a file.