For long belt life, the belt MUST be perfectly aligned between the two pulleys. The MIN400 Grinder Complete automatically alignes the drive belt so you can expect many hours of use, (Pop gets around 200 hours).
Use for sharpening the high speed steel blades that come with the Mini Grinder. Tip from Pop: File the teeth straight across ...do not angle them! Also keep force on the upper edge of the teeth so as to sharpen the 'hook' or you will get burning when carving.