There's a certain amount of pressure on the parts at the pivot point, they just grind against each other, even with a bit of lube. I believe that's why Lee plated the handles. They could be made out of cast steel, like Ruger makes gun parts. But the price point of the unit would be too high. Casting in zinc alloy is much easier and cheaper.Years ago.....I wrote to LEE and suggested that they make their product out of better metal.
You'd probably be too worn out and mentally tired after putting the primers in one by one by one by one by one.I think I broke 5 or 6 before I bought a K&M 5 years ago. I don't think I could break it if I wanted to.