There's Room at the Top for Long Stock
Finding floor space for a table extension in a crowded shop often means that you have to rearrange tools or other objects in the way. But the next time you need support for a long workpiece, look up to your overhead floor joists for help instead.
To make this temporary support arm, simply clamp a 1x4 to an overhead joist with a large C-clamp. Then, clamp a shorter horizontal 1x4 to the vertical piece and position it level with your tool's work surface. If the clamps don't hold the weight of the workpiece, attach the 1x4 to the joist and the scrap stock to the 1x4 with wood screws.
—Frank Henderson, Liverpool, N.Y.