Loose shelves in cupboards and bookcases can be adjusted at various heights by several methods. Studs and sockets (272:1, 2) require holes to take the sockets drilled at regular intervals in the carcass sides back and front. Positions can be squared across the matched carcass sides and drilled before assembly, and if they are very numerous it will be convenient to prepare a wood or metal template bar bored out at the correct intervals—1 in (25 mm), 11/2 in (38 mm) or 2 in (50 mm) etc. according to the estimated use—which can be G-cramped/C-clamped to the carcass sides and the holes rapidly bored with a drill and bit, limiting the depth with a stop or a small block of hardwood on the drill. Figure 272:3 is the bookcase strip which requires grooves worked at two levels (272:3A), while 272:4 is the magic shelf wire which is completely invisible when assembled. Holes 1/8 in (3 mm) diameter are bored to take the wires at a distance apart (front to back) fractionally less than the overall length of the wire (272:4A) which is sprung in position with a corresponding stopped groove (272:4C) worked at each end of the shelf. The wires are obtainable in various lengths or in short sections (272:4B), two of which will be needed per shelf end. The system is very positive in action, and the wires cannot be displaced with the shelf in
position as there is only sufficient play in the groove depth to ensure an easy sliding fit.
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