Abstract: Two planar members or two members having planar parts are interconnected using one or more assembly tubes which extend between the two members in an aperture in each member and are normal to a planar part of each member. Each end of the assembly tube is clamped against the respective external face of each member thereby providing the interconnection. A bracer tube encircles each assembly tube between the respective planar parts. As a result an assembly is obtained in which planar parts of the members are in parallel spaced apart relationship with respect to each other.