Lol that grinding wheel reminds me of a time I was in Turkey. There was a little old Turkish man in the market that was "sharpening" knives with one of them run off a small generator. The women were taking their kitchen knives to him. He would takes the knife and just let rip on the stone......sparks galore and no cooling in water for this chap ohhhh noooo sireee just lots of sparks and temper destroying heat. It still makes me cringe but I guess it was good for repeated business, he was there every week and no doubt doing the same knives for the same people as there is no way in hell that after he had his hands on them they would hold an edge