Abstract: This invention provides a novel sideboard construction, which includes at least one hanger rod of which a portion is embedded in the material of the sideboard, the sideboard also having a plate member equipped with a non-circular opening through which the hanger rod passes. The hanger rod section is also non-circular in the region of the plate member, and the relative dimensions of these two are such that the rod is rotatable within the opening between a first position in which it binds against edge portions of the opening, and a second position in which it does not so bind. The rod in the second position can be moved lengthwise through the opening, and in the first position is "jammed" or caught in the opening, and thus capable of supporting the weight of the sideboard as the latter is suspended inside the top of an open-topped metal ingot mold. The material of the rod is softer than the material defining the opening.