A leverage accessory for hand-held power drills comprises a lever having a handle at one end and a sharp pointed tip at the other end for plunging into sheathing attached to the stud or joist being drilled. A master fixing base for determining and supporting the position of a master medium, which bears transfer data, and a conjoining apparatus for conjoining the master medium and the slave medium that is to receive the transfer therefrom are provided. In one embodiment, two microphones are used, with the signal phase from one microphone being inverted prior to combination with the signal from the other microphone. One connecting rod of each parallel connecting rod unit is fixed with the relative rigid duct to actuate the rigid duct to move. for not less than 3 minutes but not more than 2 hours if necessary, and then heated in a hydrogen atmosphere at 700-1200\xb0 C. The at least one load sensor is further configured to generate a signal representative of the at least one force component.