Atlantis spacewalkers have completed replacement of three gyroscope assemblies on the Hubble Space Telescope, the mission's top priority.
But the last set was an old spare, not a newer design, which the crew resorted to after repeated attempts to install the new unit failed in two different locations.
The spare proved a tough fit as well.
"I'm wrestling with it the best I can, but I just can't get it in," said spacewalker Mike Good, who was positioned on the end of the shuttle's robotic arm with a drill.
He eventually got the job done.
The spare is the same type of gyros that was installed in 1999, the last time the telescope got a fresh set. Only three of the six gyros installed then were working before today.
Successful installation of two new sets met the mission's minimum success criteria. Three constituted full success.
Space news and analysis from Kennedy Space Center and Cape Canaveral 
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