Assembly Item No:OFM0163 Instruction A Qu 4 PCS B = 7 STEP 1 Insert casters 5 to bottom of the spider base 2. 2) | STEP 2 Attach the plastic cover c on top of the spider base 2 then insert the gas lift 1 to the center hole of the base 2. 2 1PC 1Pc 1pe A. STEP 3 STEP 4 Use bolt A and Allen key B to attach mechanism 4 to bottom of the seat Assembly completed. cushion 3, make sure the holes on under EXTRA PARTS seat align with metal plate,then fasten \ bolts to secure.