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Tormek is fully focused on sharpening. All the product development, engineering work and production are made in Sweden. The company is located in Lindesberg, a small town in the heart of Bergslagen with a history in mining. The production is carried out in close cooperation with selected suppliers, all specialized and the best in their fields. This ensures the highest quality and a continuous access to the best and most modern manufacturing technology.
A good question, there is not really THE overall reason. When you don´t achieve a rougher surface on the sharpening stone by using,with pressure, the edge of the rough side of the Stonegrader SP-650. Don't use the surface against surface - you will glace the Stonegrader SP-650. When using the fine side, the you use the surface against the surface of the sharpening stone.
Another reson for replacement can be that the layers of the Stonegrader SP-650 are worn down or have deep grooves which are mirrored into the sharpening stones surface which gives you a uneven surface to sharpen on