The only trouble I had with my Lee Bench Prime was on the first 60 cases primed. I reread the instructions, mounted the tool solidly, and allowed the handle to go through its full travel. The full travel allows the next primer to fall into place and "actuates" the small spring on the back of the tray. I am approaching 2,000 cases primed trouble free. I dump a sleeve of primers in the tray and prime 100 cases, non stop...
I was talking about what my Dad said to me. No offense intended to anyone...