Chair malfunctioning.

The chair was easy to assemble, and is kind of comfortable, but the spring that holds the lever down for the backrest adjustment is weak. The chair is advertised as rated for 300lbs, however I am 180lbs and if I lean back the spring gives out and the chair ratchets back as far as it will go. This makes the chair back unusable as I can't lean back against it and have it stay where I set it.

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