dsc33429.jpg

The vertical structural member appearing in the left of dsc33410.jpg.

Note the S-3D engine's gimbal actuator (the small, rust-colored cylinder at top center).

The short, empty cylindrical items mounted at angles to each other would hold structural rods to give rigidity to the aft skirt.

Picture 1 of 2.

I have a detail of the round cover at lower center at dsc33424.jpg.