My wife has never been comfortable with anything except 22LR firearms, but she's quite good with the ones she is comfortable with. Our current "defend the bedroom" gun is my old Marlin Model 60 because it is one of the guns she's best with. However, it's always made me uncomfortable that didn't have a light attached to it. I finally got a chance to rectify that this week!
The mount is printed in silk PLA and fastened with some small metric socket head cap screws (M3, I think), washers, and small nuts. This version is for lefties and has the light on the right side of the rifle, but it can be mirrored in your slicer if you're a right-hander. Unless you're trying to mount an Acebeam EC35, you're probably going to have to modify the CAD file so that the light will be firmly held.
Files to print are hosted on Thingiverse, and MyMiniFactory, but the Thingiverse link isn't active yet:
https://www.myminifactory.com/object...-holder-161810
https://www.thingiverse.com/thing:4799367
Let me know if you have trouble accessing the files to print and I'll see about getting them to you.