Have a couple of oil stones which I use to sharpen kitchen knives and chisels with. The oilstones always seem to wear unevenly, leaving a slight hollow along the middle, lengthways. This causes a problem when sharpening a wide blade chisel or even more so with a plane blade.
Is this due to a poor sharpening technique or just natural wear ? I know that the oilstones are cheap to buy but they never seem to wear out in terms of their thickness. Is there a way that they can be resurfaced to provide a flat and even sharpening surface once again or are they just fit for scrap ?
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