Flight controllers are revamping plans for the remaining spacewalks set to take place during space shuttle Endeavour's visit to the international space station, after a crucial tool bag floated out to space during a repair trip.

The briefcase-sized tool bag drifted away from astronaut Heidemarie Stefanyshyn-Piper as she cleaned a joint on a wing of solar panels.

Controllers are considering having the two spacewalkers share astronaut Stephen Bowen's pair of grease guns for the three remaining spacewalks.