Office Chair Free Assembly

The assembly steps for the free-style office chairs vary depending on the specific model. Here are the assembly methods for common models:

M69 Free-Style Model

1. Prepare Components: Before installation, ensure all components are ready and complete.
2. Install Chair Base and Gas Lift: Insert the five casters vertically into the chair base one by one, then insert the chair base vertically into the gas lift.
3. Connect Armrests and Backrest: Use four M8*35 screws to connect the armrests and backrest.
4. Install Tray: Place four M635 screws with washers and four M618 screws to install the tray.
5. Install Armrest Decorative Covers: After completing the above steps, install the armrest decorative covers.
6. Connect Armrests and Seat Cushion: Use four M6*35 screws to connect the armrests and seat cushion.

NB15 Free-Style Model

1. Secure Armrests and Backrest: Place the backrest with its back facing up and the side holes positioned forward; align the left and right armrests with the side holes of the backrest and snap them in place, then tighten 2.5CM hex screws at the connections on both sides to secure the armrests.
2. Connect Seat Cushion and Armrests: Place the seat cushion with its hole side facing up and the side holes positioned backward, aligning with the holes on the left and right armrests on the inside.
3. Install Free-Style Bracket: Locate the free-style bracket, align the iron plate holes with the middle holes of the seat cushion, pay attention to the handle orientation, and tighten with 2CM hex screws to secure the free-style bracket.
4. Assemble Five-Star Base and Wheels: Press the wheels firmly into the holes around the five-star base.
5. Insert Gas Lift: Align the large end of the gas lift with the middle round hole of the five-star base and insert it, then align the round hole of the seat cushion's free-style bracket with the gas lift and insert it.
6. Install Headrest: Align the support frame with the card slot on the back of the headrest and snap it in place, align the holes of the support frame with the upper holes on the back of the backrest, and tighten with 2.5CM hex screws to secure the support frame.

Universal Free-Style Computer Chair

1. Inventory Components: A complete set of components generally includes a backrest, seat surface, chassis, five-star base, gas lift, casters, headrest (for some models), fastening screws, and a matching hex wrench.
2. Assemble Base and Casters: Place the five-star base flat on the ground, align each caster with the interface of the base, and gently press it in until you hear a 'click' sound indicating it is securely installed.
3. Install Gas Lift and Chassis: Flip the base over, insert one end of the gas lift into the center hole of the five-star base, shake it to confirm it is secure after inserting it all the way; then align the center hole of the chassis with the other end of the gas lift and press it down to combine the two, temporarily without securing it.
4. Install Backrest and Seat Surface: Lay the backrest and seat surface flat on a level surface, align the connection holes, and tighten them one by one with the matching screws and hex wrench, being careful not to tighten the screws all the way at once.
5. Assemble Components with Chassis: Flip the assembled backrest and seat surface components over, align them with the installation holes on the top of the chassis, and secure them with the provided fastening screws, tightening all screws with a hex wrench.
6. Adjust and Test Components: Place the assembled whole on the base with installed casters, pull the free-style lock lever on the bottom of the chassis, try the recline angle and locking effect, confirm that the height adjustment of the headrest (if any) is normal, and ensure there are no abnormal noises or looseness in the whole.