By reference to the cut, Fig. 63, the joint and one side of the body of a bullet mould, it will be observed that the line A is the surface where the two halves abut or come together. The line B is drawn at right angles to this and in the diametrical centre of the round projection that is to form the joint. At the point of intersection of these two lines, or in other words where these two lines cross each other, make an indent with a sharp-pointed prick-punch, and there drill a hole of the size that the rivet is to be made. [Illustration: FIGURE 64.] Fig. 64 shows the finished joint ready to receive its mate and be rivetted together. After the hole for the rivet is made, a tool must be used to “sweep” or cut down the surface at C, and also leave a sharp and smooth shoulder as shown at D. [Illustration: FIGURE 65.] To make this tool, select a piece of steel, centre it in the lathe, and turn one end—say an inch or so—of the same size that the joint is to be. In this end drill a hole lengthwise, but exactly in the centre, of the same size that the rivet is to be. Cut teeth on this end, and temper as any tool for cutting metals. Insert a steel pin in the hole, leaving it projecting half an inch or more, and the tool is ready for use. The cutting end of the tool is shown in Fig. 65. Of course the other end must be fitted to the lathe chuck or a bit-stock in order to use it. Insert the projecting end of the pin in the hole A, drilled for the joint, and by means of the lathe or bit-stock, cut down each half of the mould to about half of its thickness. The outer circle or cut of the tool will be a guide to which to file the circle of the joint. If the cutting end of the tool be made a little convex it will form the surface of the joint a little hollowing, and a better fit will be the result. Countersink the outer ends of the hole, insert the rivet, and rivet them together. The perfection of the joint can be ascertained by opening and closing the mould a few times, removing the surface where the rubbing is apparent, with a fine-cut file. If the surfaces of the two halves at B, Fig. 64, do not exactly come together, and the material be brass or malleable iron, a few blows with a hammer will insure close contact. It may be necessary to say that the surface at B must first be made true and square, so that the two halves will fit closely, and then “lay out” the joint from this surface.