Astronauts moved an old docking port to a new spot on the International Space Station late Monday in the second straight day of tricky crane work 220 miles above Earth.

The astronauts used the station's 57-foot (17-meter) robotic arm to attach the old docking adapter, a cone-shaped connecting piece, from the top of the orbiting lab to the outboard end of its newest room Tranquility.

The crane work ended at 9:28 p.m. EST (0228 Tuesday GMT) and came one day after a new observation deck was plucked from the end of the Tranquility module and attached to a bottom port, where its seven windows are expected to give astronauts unprecedented views of Earth and space.