Here is a simple belt holster for a Maglite flashlight. It is for one of the larger sized one with the 1 ½ inch (38.5mm) diameter handle.
The Fusion 360 file is included if you want to try and edit the diameter for a different sized hole.
I designed it to hold my Maglite during a caving trip and it worked well even when crawling on my stomach through tight spaces.
The author marked this model as their own original creation.