Right, that is the part I’m talking about. The D-shaped piece. For some reason it gets stuck when I try to put it back in. And i am aligning the piece to the cutout. I don’t know if you experienced that issue when reassembling yours.Not exactly sure what you are talking about but it looks like a D shape. Its got to go back in that way. Unless there is a different problem I'm not seeing. Lots of knives have that.