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Firm leather, pastes on glass, honing films, etc.... would all work well if after a truely rigid format. Even a loom type leather strop would do if tensioned highly enough, just remember to loosen...

I think you will find that leather, if it has any abrasive qualities at all will be far finer than even 0.25 micron paste. One can strop for months on a variety of leather strops and the surface will...