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With all the above I agree. The Coticule can be made to substitute for a 4K but it takes a bunch of practice and getting the right stone. It is an advanced technique that can be applied to a number...

Just a quick note.... when testing the edge for microchips etc use the
Thumb Nail Test , TNT, not the Thumb Pad Test, TPT.

When your honing the edge of a Ebay vintage or antique store razor...