Apply a small amount of petroleum jelly or anti seize lubricant to your grinder’s motor shaft and set screw before installing your bit. The lubricant will prevent glass powder from impacting in the bit cylinder shaft and making the bit difficult to remove for replacement and cleaning. Remove the bit regularly and clean any residue glass powder.
Compressive grouping of the diamond abrasive occasionally creates small surface areas of bunched diamond. To remove the small surface bunchings, attach your bit to the grinder, turn the grinder on, and with a piece of scrap glass, grind up and down the bit 3 or 4 times. Bunchings are only surface residue from the manufacturing process and do not reoccur.