A Zack Freedman Gridfinity 1x1 mounting block suitable for the Pelican 3310 Flashlight (https://amzn.to/3J3ef2i). Tinkercad source for the model available at https://www.tinkercad.com/things/by46uo3kcdq.
If the base “sticks” to your flashlight, you can either file down the insides, screw it to the base plate. or print the base in clear filament. :D
The author hasn't provided the model origin yet.