I have a steel case chair 430312 and can not figure how to adjust up or down or how to stop the rocking back and forth. Only one knob in the center of the chair
This chair is a Twist o matic Try turning the chair counterclockwise to go up, about ten spins should do the trick. You'll know you have reached the height limit when in starts to do a clunking sound. The same applies when you go down. I usually sit on the chair before turning it, so that I can see the difference when I sit on it again. If this doesn't work, the twist o matic device may be faulty and you can order a replacement through a dealer in your area.
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