INSTALLATION INSTRUCTION (941) fans Mexico $x Somme Mexico Connect the chair leg to the chair base vertically as the picture showed. If you have any problem, please contact us, and we'll provide you with an installation video of step one. 2. Insert all wheels into the chair base, then connect it to the gas lift cylinder. Use long screws (11) to connect the armrests to the chair back. 4. Use long screws (11) to connect the armrests to the chair seat. 5. Use short screws (10) to assemble the piece 6. 6.