Hide san at work
Peeking around more sakaihamono.com site and found some more videos. I think some of this videos feature Hide-san -- think Gesshin Hide -- himself at work doing his sharpening things.
And this video is hand dragon engraving that Jon was talking about at one time (remember that lefty Gesshin Hide yanagiba?), not sure if it is the same craftsman or not. Video dated 23/11, so it is quite likely, since the yanagiba in the video is also a left hander one.
different guy doing the engraving