Phil.......... I, too, think Tron is on the right track. It seems the older we get, the lazier our eyes get, especially if we don't do some form of excercise with them. I spent a good deal of time studying your first video, and even more time on your lastest video, especially the part about cross firing. I'm 63 and noticed about a year or so ago, I would make a shot, usually, almost always on a right angled target from post 4 or 5, that looked exactley as it should, yet I would miss the target cleanly. This usually happpened to me late in a tournament, or late in the day as I was tiring out. After a few times of this happening, I started to notice that, immediately after missing the shot, for some reason, my right eye would see just a fraction of the front of the right side of the barrel. I'm a left handed shooter, with a strong dominent left eye. I put a crossfire eliminator on the barrels, both the single and the O/U, and the problem wasn't as bad, but, still, once in a while, it reared its ugly head and another target got lost. I went in and had my eyes examined, and spoke with the doctor about the problem I was having. She advised me to decrease the RX in the right lense of my shooting glasses a little to force my donminate left eye to keep me from letting the right eye have as clear a picture of the target as the left lense does. These changes, as well as regular practice (Daily) with my Hendrickson Lifesaver Card, seems to have cured the problem. My scores are where they should be, and I have not noticed a crossfiring problem over my last 3-4000 targets. I can't swear this is the answer, but it has worked for me..... Dan Thome (Trap2)