Made a few from this Digikey design. These little square flashlights make a great body.
First I removed the LED board, battery terminals, and plastic screw holes.
Then, I use painters tape top secure the box together and a sharpie to mark my holes.
Drill out button and battery connector holes, remove tape, and place them inside of the box.
Solder the chip to your board and make your connections. Used 18 gauge stranded.
Pop thumb wheel pot
through existing hole in the back and LED to the top of the circuit board.
View from top.
vaping Mocha Coffee at 5.2v
Enjoy!