Post a screenshot of your hierarchy in 3dsMax... looks like your bolts and meshes are not properly linked under mesh_root. You should have stupidtriangle_off under mesh_root and then all the meshes in a hierarchy under them. mesh_root >> stupidtriangle_off >>>> your mesh hierarchy ...also, you need to use "Affect Pivot Only" and move the mesh objects' pivot to [0,0,0]