Used ARTINO Cello Practice Mute PM-02

This is a listing for an ARTINO cello practice mute, model PM-02 (made in Taiwan).

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I purchased it new and used it only a few times. It has been stored at home for a long time.
The exterior is very clean, but one of the bolts does not tighten securely.

This issue was present from the time of purchase, so I believe it is a manufacturing defect.
The nut does not seem to be securely fixed to the internal resin, causing it to spin freely when tightened.
This does not affect usability, and the nut will not fall off, nor will the mute come off during use.