I took a cheap alum. housing flashlight (2 D cell) and unscrewed the end cap. Pull out the spring in the bottom.
Drill a hole that matches a bolt (size, thread count and length) which will fit in the stabilizer hole. Slide a washer on the bolt and put it through the hole. Tighten a nut on the outside of the flashlight cap (might want to use a little loc-tite or super glue on the threads).
After it is tight, screw the bolt into the stabilizer hole. If the bolt bottoms out before it is snug to the bow, either get a shorter bolt or cut the one you have off. If you are worried about scuffing the bow, cut a "washer" out of adhesive back foam from Wal-mart or a hobby store.
Once you get all this squared away, put the batteries in the flashlight body and replace the cap. Screw it to the bow, and Robert is your mothers brother.
I have a red lens on mine, cuts down on the brightness of the light (still plenty to see) and I don't think animals can see it as well.
I have buddies who have built these with momentary switches so they can turn them on with bow hand pressure. I don't see the need so just use the switch on the flashlight.
OkKeith