ocr: To Hoist Service Fuel Cell Shelf Module 106 - - - - - C Y b - - Service Module I A - Mold Line Counterweights Sling Bolt -Locking Screw, IA - - - - A - Rubber L Pad D - . 1 - - - - - Point of failure Chains permit adjustment Sling Adapter ot balance weights. Oxygen Shelf and Hoist Assembly