I have a Bear Super Kodiak and wanted a flashlight on it mainly for practice purposes, so I could get a better idea of what my bow arm was doing and how I held the bow through the shot sequence... using it at night, of course, and watching where the light beam went as I shot. I also wanted to have some fun shooting at night.
I have a Fenix FD40 adjustable beam flashlight. It has a tripod/monopod mount in it, female threads. I wondered if I could use that to attach it to the bow. I knew it fit onto the male thread on the top of a walking stick, where the handle comes off and you can attach a camera or scope. So I tried fitting the walking stick's male thread into the female thread of the bow, which is built in for attaching a quiver. Perfect fit. Then with a little checking online I learned the flashlight and walking stick have standard 1/4" threads, used for most tripods, cameras and monopods. So I ordered a male-male adapter made by Fotasy, and a mini ball head camera mount made by Giottos, on Amazon. The male-male adapter goes into the bow and the ball head mount, the flashlight goes on the ball head mount, and all together you can adjust and lock the flashlight in almost any position you want. The Fenix FD40 is light enough, yet throws a powerful flood to spot beam up to several hundred yards and with 5 different brightness levels. It works great.