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Fascinating... I've been using "high speed" (square hole) screws extensively, which, it turns out, is the Robertson design... https://invidio.us/watch?v=R-mDqKtivuI
Fascinating... I've been using "high speed" (square hole) screws extensively, which, it turns out, is the Robertson design... https://invidio.us/watch?v=R-mDqKtivuI
They're very common (and I usually choose them over Phillips head screws) at our hardware stores here in NZ.