Batarang from "Arkham Asylum" Game

Step 4 Beveling the Wing Edges

Now it is time to bevel the chisel edge of the wing blades. Mark a line that runs parallel to the edge of the wing, then, using a flat file, form the blade. Because you are using two sheets of plexiglass glued together, it’s easy to mark your progress by the center join (but because you are not making an actual working blade, you don’t need to file all the way down to the center of the wing thickness). Spend some time on this: a good consistent bevel is important to the final look of the batarang, although paint will help if you can’t manage it.

When this is done you can glue the back piece to the fixed wing to form the back assembly, the half of the batarang you hold in your hand (assuming you are right handed). When the glue dries, do a final filing and sanding of the places they overlap to make them completely true.