Troublesome knob. Can't tighten all the way

You can't sit up straight very well in the chair. You must be sitting back and lounging a bit at all times. And the knobs are too small to use, especially with arthritic hands. I can't tighten them enough to where the chair doesn't move at all. But I do like the blue color quite a bit. Not happy with this Amazon Basics purchase. Its a shame because all other Amazon Basics items I have gotten have been fantastic.

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