My Lee universal decapper keeps popping up even though I've got it cranked down (yes the pin, not just the die!). Didn't notice it for a run of 20 rounds! Gave my bullet puller a workout! I didn't notice anything wrong, just seems to do it at random. Surprised my priming system didn't get messed up, but seems fine. Probably have a few live primers in the bottom of the press! Any tricks to this thing? Or just REALLY crank it down?