the gray/red knobs, #16 in the schematic below...
are held to the rods (part #10) with small hex set screws...
the window LATCHES (part #12) are a bit more complicated (nuts/washers,springs n things)
it might be useful to download the PARTS manual for your unit...
Airstream, Inc :: Travel Trailer Manuals
lots of good stuff and pictures too.
a bit lower on the same page is the owners manual in pdf format.