No matter whether you're dealing with new or old construction, walls are almost never straight or square enough to install woodwork without at least a little trimming. On a floating shelf installation, usually only one scribe line is needed which can be easily made with a compass. Occasionally, the job is to install a shelf into a corner or alcove so the shelf will abut walls on 2 or 3 sides. In that case it is impossible to hold the shelf up
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