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Yeah, if we take a look at the actual wedge: We can see that in addition to the offset angle of the head, it's sort of a modified chisel grind with a lip and a lip going the other way on the flatter side. Not exactly an intuitive shape, but nifty in its own way.
Here you can see what really happens.
http://www.youtube.com/watch?v=E9_9wmjK3j8 Here is comparison.http://youtubedoubler.com/?video1=http%3A%2F%2Fwww.youtube.c... Competition / Speed test http://www.youtube.com/watch?v=lTag8CLWeqw