Diamond stone
I have a df-250 on my t-8. Sharpend about 5 to 10 knifes. Now it seems "flat" like it removes almost no steel from the knife. I have read and watch many videos about this stone before bying, so I have not used to much preasure when sharpening.
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can you send me a picture of the wheel's surface on support@tormek.se.
Seems odd... the pressure should not be more than the fingertips getting "white". Higher pressure cracks the diamonds, means they get finer and finer.
What i can think is, that steel (mostly with milder steel) clocks the surface. You can clean t he surface with an eraser.