An apparatus can comprise a first hollow needle and a first ejector pin with a first portion of an outer peripheral surface comprising a stepped recess from the second portion of the outer peripheral surface. In some embodiments, the apparatus may further comprise a second hollow needle. In some embodiments, a first end portion of the cap can be configured for mounting to a nose of the apparatus. The cap can comprise the aperture that may be sized for insertion of the tip of the first hollow needle through the aperture when the cap is removed from the nose. In some embodiments, a nose of the apparatus can comprise a first support surface facing an outer direction and a second support surface facing the outer direction and protruding from the first support surface in the outer direction.