An idiot did the same thing to my Puukko with some gizmo. I watched in shock as he picked up my knife from a table AS I WAS PREPARING FOOD, slice his hand to the point it required stitches and continue to demonstrate his pocket duller. A general comment about sharpening in general: Once you have properly set up a blade a ceramic rod to hone the edge and perhaps a pass with a fine grit will usually keep better steels and edges in working order.People oversharpen knives.