I used one of the original RCBS hand primers, when they would prime one at a time. The handle broke on it, and when I sent it back, they sent me one of their new one's.(this was a few years ago) The first day I used it, the plastic lid popped off half way thru 100 primers, and I spent a few minute's picking them up. Thought I probably didn't snap it down tight enough. Second time it did it, a couple of days later, got mad, boxed it up and sold it. Bought a Hornady hand primer, been using it ever since, thousands of primed cases, and been happy. gypsyman