Coachbigdog, I'm not sure if you've bought another switch, or what, but if I'm not mistaken, the extra switch that came with the D-Mini that I sent you is not a 2-stage. It's just a standard twisty. The light didn't come with instructions, either, but if you monkey gently, you should be able to figure it out.
Use long fine-nose pliers to unscrew/screw the switch, with tips that fit into the holes/slots cut in the switch body. Be gentle, and don't over-tighten anything. When reassembling, use proper lube on the metal threads and portions of the switch cover that contact metal. There are a couple of threads on this, in the various Lumapower threads.
The Lumapower tactical momentary uses a black plastic ring that threads into the tailcap, and that has to be removed if you're using the two-stage clickie (or the new single-stage forward clickie, presumably).