Abstract: An adapter for modifying a spring clamp for use as an edge clamp. The adapter is essentially a flexible intermediate section with pockets attached at each end. Each pocket slips over one of the jaws of the spring clamp. When the clamp is forced open, the intermediate section extends from jaw to jaw across the jaw cavity of the clamp. When the clamp is placed over a workpiece, the intermediate section of the adapter deforms elastically around the contour of the workpiece that extends into the jaw cavity. The edge clamp exerts an edge-clamping force against the workpiece in a direction that is substantially perpendicular to the clamping forces exerted by the jaws and parallel to the longitudinal axis of the spring clamp.