PositionMesh.
Failing that, you can re-export it from your modelling software. Ensure that world coords 0,0,0 in your modelling software are positioned where you want the axis to be, BEFORE you export.
Failing that, you can re-export it from your modelling software. Ensure that world coords 0,0,0 in your modelling software are positioned where you want the axis to be, BEFORE you export.