Lately my SDB shellplate isn't fully indexing when I operate the handle. I'm using a 9mm die set. What happens is that the shellplate rotates, but not enough to clear the primer cup. Maybe just a hair, like maybe the width of the primer cup, short of where it should be. If I force it, the primer cup pops up with an audible "ping" and launches the primer or sometimes just flips it over. So now I need to give it a little push to get the shellplate into position so the primer station works as it's supposed to.
Any idea what's going on here?