Joe Allen held a 1,285-pound satellite over his head for 90 minutes, in a spacesuit, 225 miles above Earth. No tether connecting him to the shuttle behind him. The clamp that was supposed to lock onto the satellite had failed because a piece of metal, one-eighth of an inch, stuck out further than the blueprints showed. There was no backup plan until the crew made one up on the spot.This was November 12, 1984, and Allen was in the middle of history's only space repo mission. Nine months earlier,