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Jim,
I'm thinking that even if the blade is warped the narrow paddle (cupped or not) would help a warped blade as it has less contact area so would follow the cup easier than a wide flat stone.
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I'd be glad to take a look at it if you like.


Even if uneven <g> and X-pattern should create even wear across the blade as at some point evey inch of the blade would still contact the high...