I just found a shop today in my travels that carried this sight and have been wanting to try it.. The minute I picked it up I couln't believe how bright it was. After I put it on and sigthed it in I went to atach my quiver and even with the bushings they supplied I couldn't move the sight very much. The owner said he has set up a few and had that problem. He just unscrewed the knob that is closest to me (farthest away from the cosmic ring)took it completely out. Said that the front knob was the one that tightend down the moving part the front knob was just an extra precaution and selling point. I did this and works perfect shot it at least 50 times and it hasn't moved a bit. Great little sight small and compact light and man what a bright pin.