First you cut out a small square of metal. Then you use the same method as cutting a paper heart though instead you make an arrowhead. Trace the image onto the metal and cut it out. Use a ball peen hammer to texture the metal. Grind down any sharp edges. Oxidize the metal with a torch so it discolors. Use a piece of sandpaper to remove some of the oxidation to highlight the hammer blows. Finally use a constrictor knot to tie it on a piece of cotton cord.