I downloaded this solid asm from traceparts but when I open it up the model seems locked and none of the parts will move when i grab them. I want to add rotational mates but it doesn't seem to allow it. Attached is view of open part.
Thanks for the help.
The (f) prefix to the part name in the Feature Manager shows that both parts are Fixed. Right-click one of the parts and select the Float option, then apply mates to suit.