So, i am making this folder, and wanted the handle to be "skeletonized" (refer to picture below) the handle is made of some old scrap mild steel, its about a quarter inch thick (i wanted a nice heavy beefy handle so i can actually use it for hammering or whatever odd job im workin on) and i would like to know what the easiest way to cut out those triangles would be, besides a hand file. (Plasma cutter is not an option haha) i have every imaginable file, sander, dremel bit, drill bit, hacksaw and a propane torch, and a bunch of other basic tools to work with.