Abstract: A compact apparatus for applying equal force to opposite sides of a workpiece including an arm mounted on a frame for movement in a plane to be rotated into alignment with the workpiece. The arm is moveably connected to the frame and is guided into position to engage the workpiece by tracks and followers. The workpiece is engaged on opposite sides by a tool and an anvil which perform an operation thereon. The forces applied by the tool and the anvil are equalized by a pivotable member to prevent distortion of the workpiece while performing the operation. The pivotable member engages a biasing spring which is connected to the frame on its lower end and engages the arm on its upper end to urge the arm in one direction relative to the frame.