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Draw boring / Trenails / Interference Joints

- a process in jointing timber where holes in for example, a mortice and tennon, are drilled slightly out of alignment, so that when a peg is inserted, the joint is drawn tightly together. Thickish round and tapered pegs, sometimes referred to as "trenails" are generally used, hammered as far in as possible, they are often left projecting. Where joints are not drawn, square pegs are sometimes used, because the corners give extra bite. Joints which are not "straightforward" but have been given added strength in some way by for example, being draw bored, are often collectively referred to as "interference joints".