Darn. This is along the lines of my question. Years ago, before the rush of bright LED lights, maybe even before SureFire, I bought a weaponlight setup for a 1911 that was stamped sheet steel, the "anchor" being a flat that slipped under the right grip panel (this was before pistols with mounting rails on the dustcover), and the light being a mini-mag that extended along the right side of the pistol above the hand but lower than the ejection port. The metal was stamped to fit the curve of the mini-mag, then a tube of heat shrink held the light in place. There was an aftermaket endcap switch that had enough wire to let me choose the location for my pad switch.
Even back then, a standard mini-mag wasn't a lot of light. I ended up taking it apart, using the mini-mag with a stock cap, but keeping the rest of the assembly. Now that the Mini-mag Pro is out there with 226 lumens, I've been thinking about grabbing piece of heat shrink tubing from work and reassembling my weaponlight with a light source that has plenty of output.
From what I'm seeing here, it looks as if my original switched endcap will not do the job. I'm disappointed. Sure, Brightguy has a sale on the mini-mag pro and pro+, but I'll have to find an endcap with pad switch on a wire, that fits the mini-mag pro, then add in that cost. Darn. I wonder if there's a suitable switched endcap available yet, and what it might cost.