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This makes sense. As the entire edge is now as short as the "low point" of the previous frown, the whole spine should also be as flat as the bit that corresponded to that same "low point".

I would suggest the wiki is changed. As per my previous message I read this to clearly mean perpendicular, which is what I did (unfortunatley).

Claude

I have just finished reprofiling my first frowning blade. I read the wiki and decided on the breadknifing approach which was simple enough but I was amazed at how long it then took to reset the bevel...