You can try to just loosen the shell from the shell body; unscrew it until it resets then screw it back together. I also pull the shell from the shell body, like I'm trying to pull it apart while I'm uncscrewing it, this seems to work best. Obviously you've had these apart before and you don't need me to tell you not to screw it out too far as the bearings will fall out into the shell...
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