Work Height

My pneumatic seat height adjustment doesn't work on my computer chair. How do I fix it?
I have a computer/office chair with the Pneumatic seat height adjustment. I can raise it up by pulling the lever, but when I sit on the chair, it slowly drops down again. What can I do to make it stay in one spot?
There are seal in the pneumatic that stop the air from escaping and it sounds like they are worn out. To repair the chair would most likely exceed the cost of just buying a new computer/desk chair.
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