If your grindstone has worn down and become uneven, this can be easily fixed with the TT-50 Truing Tool. This truing tool uses maximum precision and a diamond tip to remove the top layer of the grindstone at the point where there is too much material. This restores your grindstone back to a round and flat shape. The TT-50 Truing Tool fits all Tormek machines with universal support and works on all grinding wheels (except the diamond grinding wheels).