Does your favorite chair move down towards the floor as you sit in it over time. If it does and you constantly need to keep adjusting it then the pneumatic cylinder is more than likely worn out. You can replace the cylinder or use this method shown here to get the job done. Doing so will fix the chair height so that is no longer adjustable using the handle but will never move down on you again. It only takes a few minutes and some free or cheap bits.
Fix Sinking Office Chair
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