You need a pretty sensitive manual dexterity to detect the ring inside the case with a bent paperclip. Maybe if the tip of the clip is filed to a fine point it would be better. I wasn't sure if I was feeling the ring or not so I finally resorted to sawing the case in half to see if there was a ring. There was, but I couldn't feel it. So I looked closely at the outside with a magnifying glass and now I feel confident when I see a faint line in the head area I am pretty sure that's a case working its way to split. Sometimes, if the line is not real evident I might load and fire it to see if that line got worse, and it usually does, thus confirming that I do know what I'm looking at. That case either gets tossed or is used as a dummy for seating purposes.
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