I am thinking a brass, copper or stainless tube with the use of solid thin wire or plastic or whatever you can think of walking around a hobby or hardware store. fill the tube with the rod/pins in the shape of an arrow head and epoxy. Challenging but not nearly as impossible and the creating the arrow head shaped tube - not to mention the micro router perfection to get it in place and not look all boogered up. I know someone could do it, but not me.