How do you enlarge a Lee Sizing die? I want to go from .311 to .312 or .313. I know that I can order a custom, but it seems like emory cloth would do the trick. Just guessing here, but am thinking that emory cloth fastened to a dowel, and spun with a drill would work fine. Could use a fine grit for a bright polish. Seems like it would work if done carefully.....