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Kadee sells a reasonably priced set for each size. The set contains the tap, a drill bit to size the hole for tapping, and a drill bit that sizes a hole that the screw will fit through without the threads engaging (clearance bit). You can get 2-56 screws of assorted lengths, nut and washers at Radio Shack. This size fits the center hole of a #5 Kadee draft gear box and is what I use on 90% of my coupler and truck applications. For tapping plastic I have cut the head off of a 2-56 screw and chucked the threaded part in a pin vise. Also if you have access to a drill press, drill the hole to be tapped and then chuck your tap in the press. Turning the tap by hand in the press starts the tap straight.
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