This knife sharpening firm has a short thread cut test I have found edicting to watch. Hope I do not cause you to stumble. How sharp is a Feather Hi-Stainless double edge safety razor, made in Japan. | How sharp is a Feather Hi-Stainless double edge safety razor, made in Japan. | By Vivront | Facebook - https://fb.watch/movDUds9E2/?mibextid=UVffzb