Abstract: ABSTRACT A mechanical clamp for securing a workpiece according to the invention includes a clamp plate having an end for engaging a workpiece and a fulcrum spaced apart from said end. A pivotal handle is pivotally connected to said clamp plate by a connecting rod. A base plate is disposed intermediate the pivotal handle and includes a slot therethrough for receiving the connecting rod. The cam surface of the pivotal handle selectively engages the base plate to cause the clamping force at the end for engaging said workpiece. The fulcrum concentrates that clamping force at the end of the clamp plate.