[Fields]

From the picture I would guess that the cross bar is positioned top-bottom from the cameras view.

What I'm seeing in here is over-constraint left and right and under-constraint top to bottom.
The over-constraint is nice when everything is lined up perfectly. More strength and such. You see it on a lot of equipment because it can be sturdy.
Unfortunately this is where parts bind.

Under-constraint has no binding issues, but does have alignment issues (your cross bar going on an angle)

Try drawing this out. Remove one axle (looks like there are 4 on the guide). Position the other three in a triangle shape with the axles at the points and if you connect the lines all the angles should be less than 90 deg. The triangle would be seen from the side.

o
. o
o

Take your 4th axle and place it to the inside of the frame (either above or below the triangle) Ideally if you have a 5th axle it would be placed one above and one below.

. =
o
. o
o
. =

I don't know how your guide is put together, but theoretically you could cut out one half of the axles and achieve the same thing without wrapping around the al stock.