Two astronauts completed an eight hour spacewalk today, extended because of problems with several stuck bolts.

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Two astronauts on ISS completed an eight hour spacewalk today, extended because of problems with several stuck bolts.

Williams and Hoshide initially progressed well through their tasks, but the astronauts struggled with difficult bolts when removing a faulty power box from the exterior of the space station, and then again when replacing the defunct unit with a new spare.

More information here. In the end they were forced to leave the replacement unit only temporarily attached because the bolts would simply not screw in. It was thought there might be debris in the screw holes.


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