I’m new to the forum but I’ve what did to fix the spent primer holder on my 650 was to make a lid out of duct tape then leaving a small channel where the primers fall into the tray. I also made a small wall around the opening with the tape, so that upper edge of the tape sets up against the lower surface of the spent primer tray. What I found was that the primers where actually bouncing out of the tray though the open top all over the floor. I did this on my 650 ten years ago and 98,000 rounds later, it’s worked perfectly.