When elbow grease wasn't enough, spacewalkers Joseph Acaba and Richard Arnold retrieved a hammer from the space station's airlock and whacked a jammed locking pin to get it out of the way and free an external cargo carrier for full deployment. But with the adjustable diameter pin, or ADP, finally out of the way, the carrier mechanism still failed to extend properly.

Arnold made another attempt to muscle the mechanism into place, but he was not successful. Both astronauts then inspected the mechanism again, looking for any sign of what might be causing the problem.

"You know, it's rotating there, you see where it's going, right Ricky?"

"It just looks like a simple hinge there," Arnold said.

"I know. If you look along the line of it, I don't see anything in the way."

Pushing together, the spacewalkers made two final attempts to force the mechanism into place.

"Three, two, one, go." one said as they began pushing.

"Negative," someone observed.

After a second attempt, flight controllers in Houston told Arnold and Acaba to strap the mechanism down and move on to other tasks.

"Basically, we concur with your assessment of it that we're going to need to study this thing some more," Rick Davis radioed from mission control. "So what we would like to do is implement the long-duration tie down at this time."

Because of the problems with the port-side cargo carrier, the spacewalkers were told not to attempt deployment of another cargo carrier on the right side of the station's main truss that employs a similar mechanism.

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