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Be careful using a sub 1K stone to set a bevel, it will leave deep stria on the steel and that stria can cause micro chipping in the final finishing hones.

It is better to use a 1k to set the...

Yes, the rusty one needs to be tested for edge retention. The rust pattern is similar to cell rot, it may not hold an edge.

If it is cell rot do not keep with any other razors, it can spread.
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