Chairs cylinders are sort of a commodity part, similar to casters. Only a few factories make almost all of the task chair gas cylinders in the world. You might be able to find a shorter cylinder that fits your chair on Amazon. your chair proooobably came with a 5"-travel cylinder, and you might be able to find a 3" that fits. The chair maker might even offer one, if they have any sort of real presence/distribution in the US.
Her craft fair sales have been doing pretty well, and she decided she needed an additional tier, and some extra width. The tiers also needed to be flat-pack and assemble without tools/fasteners, and lighter than those previous risers.Girlfriend has been selling her concrete pots at pop-up street fairs, and needed a way to tier the display, so the pots would be easier to see without stacking them.
She's been using plywood pieces with stacked bricks as the risers....but that meant carrying loose bricks back and forth from her car when setting up her display.
So i made some legs for the plywood shelf pieces. Made out of scrap subfloor plywood and 2x4s left over from our home remodel, so as not to spend any money on materials. I also had to make sure I could finish them between my sudden-onset IBS issues, so they ain't fancy..
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Note: this is not a construction method i would recommend. Ha!