Jan 13, 2007· The stone holders have a .385 opening so I am assuming they take a .385 mandrel 01-11-2007, 11:12 PM #2. mmachining. View Profile View Forum Posts Aluminum ... I have a Black&Decker.valve seat grinder sold under the Blue Point name. I was told the grinding wheels were no longer available. I would need to buy new wheel carriers, dresser, arbors.