If you're referring to the small post just use your dremel to grind it down. Then try using a medium grit sand paper on a flat surface and just slide the bottom of that across the surface. If you're talking about the hump next to that post you can just use the sand paper idea with the screw post off the edge of the surface. Idk if that makes sense, but I hope it may help. I don't know how you'd use a router.