I have created an assembly of a dumper with a lift on it. Now the lift functions perfectly on its own, moving up and down, but when I insert it into the dumper assembly and mate it to where I want it to be, the lift no longer moves... am I missing something? The frame is fixed so the fixed part of the lift is mated to it so it should be moving but it isn.t Any help appreciated! attaching file. This is only rough assembly, jsut want to figure out hwo to make the lift work proeperluy.