I tried to make some of the lighted arrow nocks like posted on here and the youtube video. The designs I seen have left a lot to be desired. I tried the one with the part of a nock glued to the back of the battery and if you dont get them in just right and have to turn them you wreck the light and if you try to pull them out you rip the light apart and the lights themselves are not very reliable. I did some experimenting of my own and came up with a nock using the thill lights that works exactly like the lumenock. They are a little harder to make than the ones posted. I have not fully tested them as I just made them last night but I see no flaws in unshot testing. There is no added weight except the light and glue. If anyone is interested please reply and I will try to come up with instructions and pictures.