• Send it back!
    My experience coming up, not judging... I've had some issues with loose cogs/lockrings on my polo bike lately (high torque, incredibly massive amounts of power going through the drivetrain, blah, blah) and swore blind it wasn't my fault... I now tighten and then retighten the cog and lockring at least three times before I take it out on the road, and then check and retighten if necessary for a few days afterwards... Bingo! No more problems...
    Good luck...

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