Offered here is a Van Dorn 'Valve Grinder' and 'Vibro Centric' Valve Seat Grinder Instruction Manual. This is for Van Dorn and Black and decker valve grinders. If your grinder is the older style that has an aluminun shield that swings around in front of the grinding stone then this is the correct manual. If your not sure you can email me with your model and type number and I can tell you wich manual goes to your machine.