A punch is installed eccentrically at front end of the cylindrical portion of the punch holder, which is then firmly fixed by means of the crescent-formed seat or split-half hollow cylindrical seat and the clamping block to the inside hole which is furnished at the front end of the ram.
A universal distal securement element for surgical pins of all utilized diameters, comprises a protective sphere provided with a bore for a pin and a clamping screw disposed in a tapped hole which opens into the bore. A crescent-shaped elastically deformable insert is disposed in the bore and the clamping screw bears against it. The deformable insert is deflected so that the insert has an internal cavity of progressively smaller cross section the deeper the screw is screwed into the tapped hole, thereby to permit clamping by the insert within the sphere of surgical pins of various diameters. The bore is circular in cross section and the crescent-shaped insert has edges that are disposed against sides of the bore remote from the screw, whereby upon screwing the screw progressively into the tapped hole, these edges approach each other. Alternatively, these edges overlie each other on the same side of the bore as the screw, whereby upon screwing the screw into the tapped hole, the overlapping edges slide against each other with an area of overlap that increases progressively as the screw is screwed into the hole.
