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the protector of the 3.5 mm pin which is designed to bend slight amount, has sheared off. The spring hack seemed to work for few days. It held the pin cover firmly. but unfortunately in the train the spring with wire got pulled ,that time the spring's sharp edge removed the covering part. Thus I cam conclude that the spring hack failed.
the headphone functions properly. but I don't want to lose that headphone yet so some protection is needed.