Spacewalking astronauts grease robot arm's new hand

Astronaut Mark Vande Hei made fast work of greasing the big robot arm's new hand. Vande Hei and station commander Randy Bresnik replaced the latching mechanism on one end of the 58-foot robot arm last Thursday. Tuesday's work involved using a grease gun, which resembles a caulking gun, to keep the latching mechanism working smoothly. Vande Hei got a jump ahead in some greasing chores, but the two-part job still will spill into next week, in a third and final spacewalk. "Why don't we wash, rinse, repeat. Do it again in a week," Bresnik said as the 6 ½-hour spacewalk came to a close.