I decided to remove the shell plate (550) for general cleaning. My press was functioning fine. After reassembling I find that the primers are not seating high enough & protruding significantly. I was unable to located anything, spent primer, etc., that was restricting the shell plate or the primer cup I decided to tighten down the shell plate all the way so that it could not be indexed. Then the primer seated just fine. So I proceeded to keep adjusting the tension on the shell plate, after removing the brass tipped screw, until the primers seated properly. The issue is that I used to be able to index the press much easier i.e. much less shell plate tension. I'm curious as to why? Can anyone shed light?