Search:

I almost did the same thing...

if the blade show the same warping on both sides, it's not flat (if on one side the blade lifts at the end, then if the blade is warped it should lift in the middle on the other side... if it lifts...

Richard, that's not his blade, just a demonstration of what he's seeing

I was just about to write and say: that's no Thiers, that's a Dovo... but then I read your post. If you are absolutely sure the stone is flat (try it on a marble tile or something else you know to be...