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Hi, all.
I have a VERY concave carpet/lino knife which I have been trying, without much success, to sharpen on the rounded wheel of my T7. It appears to me that with the T2 I could simply draw the blade through keeping it perpendicular to the wheel at the point of contact.  Is this correct?
TIA,
Gerald.

Hi guys,
  after the initial euphoria here come the blues!  I have two, possibly related problems.  I tried sharpening a hard, Japanese knife TOWARD the edge.  At some point the knife edge dug into the grinding stone and pushed me back.  Thereafter I noticed a distinct "click" with every rotation of the wheel.  I stopped and saw a chunk gouged out of the right side of the wheel, with a groove from it crossing the wheel surface.  I think this may be causing my problem with the Ezy Lock wheel nut.  I can't get it off.  The book says to turn the wheel clockwise to release the nut.  Even with the nut held in a Mole grip I cannot get it off.  According to the book the torque of the nut is set automatically while grinding.  Might my stopping the wheel with the knife have momentarily increased the torque to where it is now?
Any help gratefully received,
Gerald.