Anyone here have an clue on what brushes the Rocky 30 router uses? The router looks very similar to the RoutER11 sold by Openbuilds and the replacement brushes for it look the same but the checkout isn't working (can't calculate shipping costs, says it's probably too large??) So I'm going to try to go to a local place. Rocky 30 parts on-line just lists brushes without any number. Any help is appreciated.