I wanted to ask before pulling the trigger and adding it... For those of you who have the cue ball holder accessory for JB Rugged cases, how firmly does that thing hold cue balls? Last thing I want is for the ball to pop out and possibly damage my cues and could always go the Ballsack route. I don't believe that John would design anything or put his name on anything that could damage a case, but I would still like some usage impressions in the wild. Thanks!