Spacewalkers Mike Fincke and Greg Chamitoff have retrieved the power and data grapple fixture from the P6 segment of the station’s truss. They are returning to the International Space Station Boom Assembly on the S1 segment to swap the fixture with the electrical flight grapple fixture currently on the boom.
They will release the six bolts holding the electrical flight grapple fixture to the boom and cut its cable. Then Chamitoff will install an adapter assembly on the boom, using six bolts, and slide the power and data grapple fixture into place on it. Four bolts will hold it in place.
Fincke will then stow the electrical flight grapple fixture in Endeavour’s cargo bay.