This is the flashlight this is meant for:  https://a.co/d/4Aj51i1 
The hardware to mount is on the https://threadboards.com/all.php page
What you can use to mount:
186 Combination Mount and Hex Cap screw 12 mm.stl
177 HD8xTHR10HexDriver.stl , This one is 2mm shorter on the threads compared to 186 stl
185 T Handle Hex Installer.stl , or use your own allen wrench

 

There are two files:  1 with a charging port cutout, (W), and one without a charging port cutout, (WO)

Print with Supports for the Threadboard holes