Model AA-1 Adjustable Arms Parts Listing A AA-1 Adjustable Am rest 2 Units B MBx25mm Hex Screw 6 Units (e @ Wrench 1 Unit Height Adjustment Button Forward Assembly Notes: During assembly, hand tighten screws. Only when all screws are in place, you may then tighten all screws completely. CAUTION: 1. Do not use this chair as a step ladder. 2. Check for loose screws and tighten them every 6 months. 04.06.