Layout Jig for cutting a polygonal hole in a fender washer

thingiverse

If you ever need to cut a hexagonal (or other polygon) hole in a fender washer and make sure it's centered, then this is the tool for you. This only helps you mark the shape and makes sure the polygon is centered on the hole. You can cut steel washers with a Dremel and a cutting disk very easily. This is a parametric model you can open and modify in OpenSCAD, or you can use the customizer to make a marking jig for any type of polygon and any diameter hole. Make sure the polygon is bigger than the centering hole.