I had the same problem, so I used a larger 0-ring, hooking it on the powder die, twisting it to take up slack, and then I wrapped it over the size/deprime die. It added a bit of clockwise tension on the powder die, keeping it from backing off. Has worked fine for thousands of rounds so far. I reload several calibers, and all have powder dies all adjusted for each, so the quick change is a huge time saver for me so I wanted to keep that functionality.