Old bicycle innertubes that are cut into long, narrow strips can make excellent clamps for repairing broken wooden furniture. After gluing a fractured joint, the rubber strips can be tightly stretched around the repair area to hold pieces in place while the glue is drying.
Carpenters who do rough construction get very proficient at “close-enough” measuring. For example, to quickly draw a line parallel to the edge of a board, you can place a pencil at the end of a combination square and move both the square and pencil along the board. Some combination squares have a hole in the blade for this purpose.