The "tuner" as I call it, is one I read about somewhere, don't remember where. It's a....dang, wish I new the names for things like this... anyway...at the hardware store store you will find a stud that has wood threads on the outside and standard threads on the inside. The one I use takes a 5/16" hole drilled thru the exact center of the stock about 1 1/2" back from the end. I screwed the stud into the stock, then screwed a set screw into the stud so that I can adjust it while the gun is assembled. Now for the fun part. You will need a nylon bolt or something like that, that will fit nicely into the stud on top of the set screw that you can contour to fit the barrel. I've read that a nylon golf tee will work for this and am going to replace mine with one if I can ever remember to get one. This way you can adjust the pressure on the barrel and tune it in for each brand of ammo. I really havent messed with mine that much so I really don't know how well it works. In fact right now its screwed down to where its not even touching the barrel. I really think it will help especially the stock 10/22 and 597 type rifles with the aluminum receivers that arent strong enough to support the barrel if completely floated. I had a 10/22 that I had replaced the stock on with a real nice walnut Kimber stock...sure was a pretty rifle but I could never get it to shoot....real bad. I traded it off then got to trying to learn more about why it didnt shoot and found out that it was not designed to have a floated stock but has a pressure point that helps to support it instead of putting so much strain on the receiver. If your interested I could make a drawing and post it if it would help.