I sanded my k100 pretty successfully. One issue however was the connection pin in the 510 connection where it connects to the topper -- its small and difficult to work in there and I ended up with the surface coming out a bit ragged. Is that cool do you think? I can check at the hardware store for a sanding dremmel bit that's narrow enough to even it out and polish it up ... if it's likely causing a problem or defeating the benefits of sanding in the first place. Thoughts? 'preciate it