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Ivo,

Sorry, I misunderstood. I've (luckily) never had a warped blade but I can imagine how tough it would be to get an even edge on one.

I've got plenty with uneven hone wear though - the two...

Have you tried the magic marker along the edge trick? Could help you analyse and rectify the beginning and end of your honing stroke, which I guess is where you have the problems.

Using two hands...