Piano-wire-like hinge pins observed moved out of position

Piano-wire-like hinge pins were observed drift up to 50cm out of position during the Servicing Mission 3A in 1999 (seen left of centre of the image here). ESA's Hubble team were mobilised to find out whether the hinge pins might be dangerous to astronauts - capable of piercing their spacesuits - and also whether the solar arrays could still be safely furled up again during the next servicing mission.