Look at a Peak 3 LED Matterhorn AAA light. Twist on/twist off. About the same size ans a Mag Solitaire. Great little light, robust. If 1 of the 3 LED's quit, you still have 2 more. I EDC one, and love it.
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Our most important survival tool is our brain, and for many, that tool is way underused! SBRaider
Head Cat Herder