I think my sharpener may have worn out, what do I do?

First, clean it. If you have not cleaned your sharpener on a regular basis, the surface could be loaded up with metal fines (also known as “swarf” buildup) which clog the stone surface affecting its performance. If you are concerned that the diamond may have worn off the stone, rub the sharpener against an old glass jar. If the sharpener scratches or frosts the glass, then there is diamond on the sharpener ready for your sharpening needs.

 Use and Care.          Cleaning DMT Diamond Stone Video.