Great ISS photos

From the departing shuttle:
http://www.spaceref.com/news/viewsr.html?pid=25949
Anyone know what the small gizmos that look like tank turrets along the
base of the solar array housing do?
They almost look like they have levers on them for EVAing astronauts to
move in some way:
http://spaceflight.nasa.gov/gallery/...20e008602.html
(very nice shot of the repairs on that photo... that was top notch work
on both the part of the astronauts and the team that came up with the
repair strategy.)

Pat