Fixed Office Chair Cushion

The installation steps for a fixed office chair cushion can refer to the following general process, with specific details adjusted according to the actual model:

1. Install the five-star base and gas lift
   Insert the casters (universal wheels) one by one into the five holes of the five-star base to ensure a secure installation. Then, vertically insert the thick end of the gas lift into the central hole of the five-star base and gently press it until it is fully embedded. The gas lift is the core component that supports the seat height, so ensure it matches the five-star base and is not loose.

2. Secure the armrests and cushion
   Use six long, thin screws (four for some models) to align the holes on the armrests with those on the sides of the cushion, and tighten them one by one with a wrench. Ensure the screw specifications match those in the instructions to avoid instability due to mismatched lengths or diameters. If the armrests are adjustable, check the flexibility of the adjustment mechanism.

3. Install the seat pan and spine structure
   Use four short, thin screws (such as 6x35规格, which means 6mm in diameter and 35mm in length) to secure the seat pan to the center of the bottom of the cushion, ensuring a tight fit. If the chair design includes a spine (a metal frame that supports the backrest), first secure the spine to the backrest with four short, thin screws, then align the spine with the holes on the seat pan, secure it horizontally with three screws, and finally insert the top of the gas lift. Ensure the spine is aligned with the holes to avoid tilting of the backrest.

4. Attach the headrest and functional components
   Depending on your needs, use two extra-long, thin screws to secure the headrest to the reserved holes at the top of the backrest, or install additional components such as a coat hanger. The height of the headrest should match the curve of the human neck, and test the adjustment function after installation to ensure it works properly.

5. Final inspection and adjustment
   After installation, check that all screws are tightened, with no exposed or loose parts. Sit on the chair and test functions such as height adjustment, rotation, and recline to ensure smooth operation of the gas lift, seat pan, spine, and other components. If you notice any unusual noises or wobbling, recheck the tightness of the screws or the alignment of the components.

Precautions: The screw specifications (such as length and diameter) may vary among different models of office chairs. For example, the seat pan may require long, thin screws of 6x35规格, while the screws for securing the spine may be shorter. Always read the instructions before installation to avoid damaging the structure by mixing up screws. If the chair does not have a spine design, you can skip the relevant steps and directly secure the seat pan and insert the gas lift.