This is a super simple little mount that will let you put a flashlight and an 18650 battery on anything metal or magnetic. The flashlight in the picture is the PeakPlus but this exact light is sold under so many different names on Amazon. These are the crazy strong magnets I used:

https://www.amazon.com/gp/product/B098WP6V4B

Print this sucker right side up with supports for the magnet holes.