04-25-2009, 03:10 PM
Kevin is correct: those screws are self-tapping type, which work fine, but not if the hole is too shallow. You could deepen the hole by using a drill bit that will fit in the existing hole, or drill it out (and deeper) using a #50 bit, then tap with a 2-56 tap. Lubricate the tap and/or back it out frequently as you work, to clear the chips and keep the tap from seizing in the hole and breaking.
Wayne
Wayne