In order to tighten the knob you have to rotate it counter clockwise with as much power as you possibly can. Tightening the knob should stop the forward and backward rocking issue.
Place the office chair in a slightly reclining position while you keep your feet on the floor.
How to make a desk chair lean back. Roll the chair back and forth to check out the wheels. Some chairs allow you to slide the seat and forwards or backwards so that you can sit comfortably with the seat of the chair fully supporting you and with your back to the base of the backrest too. Turn over your chair and place the seat on the stack.
Desk chairs are often on wheels that may move a lot so it is common for the axles in the wheels to need some silicone spray over time. Push the tilt adjustment down tilt the seat back and release the knob. In this video i demonstrate how to fix your office chair when the back of the chair gives out or begins to lean too far back.
From there use your fingers to wiggle each screw or bolt. Adjust the height of the backrest. You don t want it wobbling or tipping over.
Adjust the lumbar position if the chair has the option for you to do so you should next adjust the lumbar support. Get some dry silicone lubricant whichever brand you fancy and find a way to spray it into the spring housing. So put your hands on the desk and begin to adjust the height of the chair until your elbows reach a 90 degree angle to your desktop level.
The first step to ensure you have maximum comfort you need to adjust your elbow angles. This transfers some of your body weight to the backrest and can help you relax. For me it was a gradual thin.
Then flip the chair back over and roll the chair to spread the silicone around the entire wheel. Turn the chair over and spray the wheels. This way it will provide the greatest support for your back.
Hand tightening is acceptable but isn t a good solution if you want a long term fix. While sitting properly on the chair with your feet down and your calves a fist space away from the edge of the chair move the backrest up or down to fit in the small of your back. Most chairs come with an adjustment knob under the chair which is used to restrict the leaning and rocking as much as possible.
Make sure it s secure. As a rule of thumb the height of the chair should keep your elbows at the level of your work surface.