When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Everyone has a different approach but do not use any type of high-speed rotary device. You can wind up taking off too much metal.
Paint the whole rotor including the letters.
What I used and worked great was one of my wife's emery boards. It is the same principle as sand paper but is stiff so you can gently move it back and forth and wind up with a perfect job. I cut the board shorter then just used it like you would a sanding block.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.