DIY Self-Tapping Screw
You'll have an easier time installing screws in hard plastic if you thread the holes with a homemade tapping screw. Using a fine cutoff wheel in your Dremel tool, cut a slot across the threads of a screw of the same thread size and pitch as the one you plan to install. (Safety first: use a vise to hold the screw.) The slot will allow shavings to escape as the screw cuts threads in the...
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