An apparatus, having an elongated main body (102) with a dovetail shape, a top surface (104), a bottom surface (106), a side surface (108) connecting the top surface and the bottom surface, a first end (120), a second end (122), and a chamfer (124) at a corner (126) of the side surface and the bottom surface at the first end. A size and shape of the elongated main body matches a size and shape of a frustoconical section (520) of a dovetail slot into which the elongated main body slip fits. A bottom (522) of the frustoconical section is spaced apart from a bottom of the dovetail slot.