A cutting blade 16, and a method of securing the blade 16 in a reamer 11 having an axial recess 19 in the body 13 of the reamer. The outer layer may adhere andor penetrate the underlying layer and offer a protective coating along with improved mechanical strength along with the ability to hydrate and become permeable to water and allow for drug release. As the bearing plate is provided with an oil channel in contact with the oil-returning hole and either one of the bearing housing and the bearing plate is provided with a first labyrinth seal in contact with the screw nut, lubricants leaking out of the rolling bearing is allowed to go to the oil sump via the oil channel and oil-returning hole.