 As with the ACS, the STIS was not designed with the intention of servicing it while in space, and one of the major challenges was to remove a cover plate held tight with over 100 screws using a specially designed tool called a fastener-capture plate, designed to trap the screws and washers and prevent them from floating into space when removed.While preparing the fastener-capture plate, Massimino encountered issues with a handrail that had to be removed to accommodate the fastener-capture plate.The handrail had a stripped bolt on the bottom, preventing it from being released.