Figure 1. Figure 2. PNEUMATIC CYLINDER BASE ASSEMBLY INSTRUCTIONS: TOOLS 1) Remove base, pneumatic cylinder, seat, foot ring (if included) and casters from box, 2V Place base (1) upside down and insert casters (5) (see figure 1). 3} Flip the base so casters are on the floor and insert pneumatic blinder {2} as shown in (figure 2} into center hole of base with green button up: Lightly push down. 4y if you have a foot ring (4) slide it over the pneumatic cylinder (2) and tighten knob (7).