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This is an extremely off-the-wall idea, but I wonder if there would be any use, at least for short-term use, in a piece of ground glass? It could be done with fine diamond paste between two sheetsof...

I think the water jet coming from the spine might tend to curl over, as it reaches the edge, and round it slightly. Maybe not a lot, but more than you want in a razor.

The thought of going out...