Wow, so I finally figured out why the light wasn't working for me initially. ATTENTION, all people attempting this flashlight/mount idea: this flashlight, if you buy it from GoodLuckBuy (which is the only place I could find this, since it was out of production), does not take typical AA batteries. It takes the 14500 type battery.
For those who don't know, 14500 batteries are AA-sized, lend way more brightness than AA in flashlight applications, and run at a higher voltage.