Hello!

I am trying to mate a gearbox to my robot assembly, however a single part in my gearbox sub-assembly is fixed and I can not move or position it. My gearbox assembly is flexible and I can move it around and rotate it, but I can't mate my gearbox to my robot frame because it is telling me that the gearbox is at a 2 degree angle. The "Float" and "Fix" options come up when I am modifying the sub-assembly itself, but not the parts, and I can't find the option in "Customize Menu" to make the parts fix or float.

I can't attach my file because it is massive, but I have included a picture below.

Any clue on how to fix this?