Secured tops of solid wood liable to shrink across the width are fixed by screwing to the front rail (189:1) and slot screwing at the back. The centres can be held down by wood buttons (189:3A), or alternatively the centre can be screwed and the front and rear slot screwed; however, excessive shrinkage might show at the front if the top overhangs the rail to a marginal extent only. Prefabricated wood tops can be screwed direct for the shrinkage is negligible. Loose plinths are pocket screwed as in 189:2, and (A) shows the angle to the fixing screws, or they can be secured with metal shrinkage plates (189:4). Table-tops can be attached with wood buttons free-sliding in grooves (189:3A), with the thickness of the buttons slightly less than the depth below the top and the groove, so that the top is pulled down tight as the buttons are screwed on. Metal shrinkage plates can also be used (189:4), and (A) shows the flat variety which are cut in flush on the rail top, and (B) the angled form screwed on. Two slots are usually provided to each plate, and the screws must be placed so that the top is free to slide across the width (189:4).
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