Why flathead screws haven’t been completely phased out or replaced by Philips head screws
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Flathead screwdrivers will never go away BECAUSE of the existence of Phillips screws.
Once you chowder the head of a Phillips screw, you need a hacksaw to cut a slot across the thing and convert it to a flathead to get it out.
Posidriv, Roberson, Spax, all good candidates for a universal screw type.
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