Stretcher Key Small wedges of wood that can be inserted into the corners of a stretcher bar frame to make it a little bit larger. This is done because canvases can stretch out over time, and begin to sag on the frame.
Stretcher keys work only for half lap-jointed stretcher bars, because there is a gap within the wood. If the frame was constructed by a framer and attached with mitered corners, this method will not work.
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