Bezel removal tool for Convoy flashlight 4x18

In Convoy 4x18 flashlight -  glass lens is held by ring - which it is hard to unscrew by hand. 
Here I made some tool for help :) 

Print from any hard material (if you don't use it in +45'C environment - PLA should be ok) with 3 walls, and any (10-20?) infill. 

EDIT: when “hand cranked” tool is not enough, is still too hard to rotate front ring (like mine, was glued?) - you can print and try “hard” version, which can have some 8mm rod thru, and can be mounted in vise, etc.