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If you use the left-handed screw properly, you do not need to pin anything. In fact, most hand-drills use this same system for attaching the Chuck to the output shaft, and they don't even have that blue spray on their screws! As far as I can tell, the blue stuff acts vaguely like Ny-Lock, making it nearly impossible for the screws to work themselves loose.
A note: make sure the Aluminum piece is as far down as it can turn and that the left-handed screw is flush with the top of the aluminum. It takes a LOT of power to get the left-handed screws the last .5-.25" down, but you need to do it. We destroyed two allen wrenches doing it, but I assure you they aren't going anywhere.
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