No precise rules can be laid down and appearances must be studied. Joinery pattern doors are usually hinged 6 in (152 mm) down and 9 in (228 mm) up from the bottom (221:3A), and wardrobe and cupboard doors as 221:3B, with an additional centre hinge or hinges equally spaced if the door is heavy or bowed in the length. Light cabinet doors are shown in 221:3C, D, while framed doors are often hinged to line up with the inner edges of the rails (221:4). It is usual to trial fit the doors in with one central screw to each hinge, and a piece of thin cardboard under the bottom rail to give the necessary clearance, while steel screws should be used throughout if the wood is hard and then replaced with brass screws in the final assembly. If brass screws are used from the onset a head may easily twist off, and the whole screw will have to be bored out with a Torus reamer or fine drill. (See also Hinges and hinging, Chapter 27, p. 267).
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