Before there was internet I had an early Hornady progressive that had a poorly designed linkage for the powder measure. Gravity and a spring weren't reliable at returning the measure fully closed. I ended up re-designing the system so it was mechanically actuated in both directions. While my mods helped the powder measure itself also proved to be unreliable. That's when conversations with folks in the know lead me to the Redding measures. That brought safety and precision into my progressive reloading.