9v battery clip with switch hole
thingiverse
A derivative of agwn's sleeve, but with an extra box on the side that's a press fit for a small slider switch. Instructions There is a small quadrant shaped hole through which you poke the positive lead from a battery clip. Cut the red wire and solder it across the switch and pass the black wire through the round hole. Twist the wires together. The switch is a common or garden variety I had lying around, but it's a nice snug fit and needs no glue.
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