Grinding wheel installation: 1. Before installation of grinding wheel, topped with lubricant, engine shaft grinding wheels need to apply a layer of lubricant inside. 2. The grinding wheel mounted to the engine shaft, the fixed screw position higher than the engine shaft. The position of the grinding wheel on the axle must be at least 1/8" diamond part above the operating table.3. Fixed grinding wheel on the shaft with hexagonal wrench clockwisely. Installation Note: Maintain stability of the grinding wheel installed in the engine shaft of the plane. Operationg Note: 1. Can not grinding without water. Ensure the grinding wheel is wet 2. When using the grinding wheel, with small strength , don't use too much strength.Too muchstrength will reduce grinding machine and the service life of the grinding wheel. 3. After usement, clean the water reservoir. Remove the reservoir, clean up the rest of the residueafter grinding. 4. In order to prolong the service life of grinding machine, cleaning and add lubricant to the engine shaft, 25 hours after each use, remove all the grinding wheel and the fixed screw. 5. If the grinding wheel not be used for a week or longer,it need to grind down on stage to prevent the direct axis stick on. This will help you to develop check engine shaft and wheel maintains a habit. 6. Don't grinding metal. If grinding metal, it will damage the grinding wheel and result in can not grinding glass any more. Package included: 1 x Glass Grinder 1 x 5/8” diamond grinder bit(MCBL58Grinding Wheel)