A saw blade lubricating apparatus has a barrel with an outlet at one end thereof, a drive cooperative with the barrel for extruding wax outwardly of the outlet of the barrel, a dispenser block connected by a conduit to the barrel and having a wax inlet and a wax outlet, and a valve positioned in or on the dispenser block. The switching device is configured to process a call request as a 12-digit telephone number. The round sling includes inner and outer jackets and a plurality of load bearing yarns. Deployment of the endoprosthesis entails inflating the angioplasty balloon to a pressure sufficient to disrupt or break the constraining sheath in a prescribed fashion, thereby allowing a self-expanding endoprosthesis to spontaneously deploy. The force sensor element according to the present invention allows simultaneous measurement of a shear force and a normal force applied to the sensor element.