Proceed Carefully Re-packing the Air cushion

1 Remove the plastic gas cartridge cover on the upper side of the key box using the 3mm hexagon wrench. (some have no plastic cover.) 2 Unscrew the used gas cartridge by turning counterclockwise. 3 To remove all remaining gas from the air cushion, spread the "Hit Air" face down on a flat smooth surface and press down on each cushion using your hands, knees and legs, removing the gas completely. To avoid internal damage, do not fold or roll up the "Hit Air". It may take time to release all the gas in the air cushion but it is necessary, as it cannot be re-assembled with gas remaining in any of the air cushion. 4 Insert a 6mm setting bolt (supplied as an attachment to the "Hit Air") into the hole at the bottom of the "key box" and tighten by hand. Then slowly tighten further with the 5mm hexagon wrench (supplied as an attachment to the "Hit Air") until the hole for the "key ball" with a ring in the aluminium cylinder is placed at the center of the hole of the "key box". 5 Insert the "key ball" with a ring deeply into the hole of the "key box". Pull the wire attached to the "key ball" downwards and lower the red slide cover over the hole. If it is blocked by the ring and does not come down, tighten or loosen the "setting bolt" and/or press down the edge of the ring around the "key ball" by the fingernail until the "key ball" fits in the hole and the slide cover comes down. 6 Loosen the "setting bolt" with the 5mm hexagon wrench to remove it. Caution! Remove the "setting bolt" from the "key box" without fail. Otherwise, the "Hit Air" will not be activated. 7 Lift the red slide cover to the 'unlocked' (up) position for reuse. 8 Screw a new gas cartridge fully into the bottom until it cannot go any further. 9 Replace the plastic cartridge cover by using a 3mm hexagon wrench. (Some have no cartridge cover.)