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“Then I increased the water jet until the friction increased again. In the end I removed the insulating tape on the back of the razor and ran to shave.”

I do hope you stropped before shaving. ...

Buy a magnifier or loupe so you can see the edge. It’s pretty much the best way to see if the bevel has been set properly for the length of the blade.

I have used a coticule for quite a while and...