Circular saw blade sharpening jig. By 1004Yoo. 12:34 video:
https://www.youtube.com/watch?v=tjxfhCi9phM
Previously:
https://www.homemadetools.net/forum/...596#post155378
https://www.homemadetools.net/forum/...057#post120382
https://www.homemadetools.net/forum/...0714#post73000