Never work on the basis of measurements taken from floors and ceilings – these are rarely level. When fitting shelves into an alcove. For example, measuring up from the floor invariably leads to the shelf being fitted at an angle. The only way to make sure of a perfect horizontal is to mark the position required for the shelf on the back of the alcove. Hold a straight-edge against this line. And. Checking with a spirit level. Rotate the straight-edge until the exact horizontal has been established. Mark this point and carry out the same procedure on the insides of the alcove to establish where the shelf should be fixed.
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