I discovered something odd today. The back spacer that doubles as the blade stop when fully opened is slightly larger in diameter than the other three back spacers. I fully broke down the knife to clean it and sharpen the edge while it was out of the handle. I took out all screws and removed the back spacers. They looked the same, they are not. When the knife went back together the blade had no side play but it moved in and out, up and down. The liner lock was further toward the show side and I could see a gap when I moved the blade at the back spacer stop. Out comes the calipers. I was right, one is different. So if any of you experience this too... measure the spacers and put the big one back near the pivot.