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On your 12k you can hone until your arm falls off and you won't flatten the spine.

As someone mentioned, if it's not shaving well the problem is not at the 12k level.

Don't use the Norton to...

What kind of 12k? What kind of slurry stone?

More strokes aren't necessarily harmful, depending on the stone...

Too many strokes with pressure can be harmful and any pressure on most finishing...