I'm a Plumber, so I was looking at what I had, and the 3/4" copper fits almost perfectly in the butt-stock. Copper is pretty light so the bolt and nut trimmed down to what I wanted made a perfect for me counter weight. I hope this can help someone else, at least until Boyd's makes a stock. But all in all, this really tightened up my flexy stock. Its very easy and worth doing for anyone that has time and is adventurous. can anyone tell me how to post pics? I have good pics of the copper and bolt.