Abstract: A method is provided for assembling a load bar assembly. The method includes providing a first linear stage having a first alignment mechanism that is configured to move the load bar assembly in a first direction. A second linear stage is provided that includes a second alignment mechanism that is configured to move the load bar in a second direction that is different from the first direction. The first alignment mechanism is positioned with respect to the second alignment mechanism such that the first alignment mechanism and the second alignment mechanism are prevented from being back-driven. The first alignment mechanism and the second alignment mechanism are configured to lock if one of the first alignment mechanism and the second alignment mechanism fails.