Which screw are you talking about? The one that holds the blade is a standard 8-32 socket head screw that screws into a threaded insert that is screwed throught the pvc. For that I used a 15/64 bit. The screw that holds on the end caps is also an 8-32, but for that I tapped into the pvc. For that one I used the standard #29 bit that is required for tapping those threads.
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