Cavity door rollers

A wheel carriage assembly including at least a pair of laterally spaced wheels mounted to opposed ends of a first common shaft, said first common shaft being supported intermediate said opposed ends by a first bearing mounted in a support structure of said wheel carriage assembly whereby said laterally spaced wheels rotate with said first common shaft relative to said support structure, at least one of said pair of laterally spaced wheels having a bore through which said first common shaft passes, one of either said bore or said first common shaft having a first projecting formation received within a first recessed zone formed in the other of either said bore or said first common shaft, said first recessed zone having a first axial length, said first projecting formation having an axial length less than the first axial length of the first recessed zone whereby the at least one of said pair of laterally spaced wheels has limited axial movement relative to said first common shaft, said limited axial movement being restrained by said projecting formation engaging axial ends of said first recessed zone.