Black & Decker Valve Seat Grinding Stone Stand Dresser Accessory Lot With Box. Opens in a new window or tab. Pre-Owned. C $481.28. Top Rated Seller Top Rated Seller. or Best Offer. criari_ocoegms (1,130) +C $197.46 shipping. from United States. 80 Grit 4" Valve Grinder Stone for Black & Decker, Van Dorn, Sioux, Thor, Hall.