Homemade sash fillister plane by Stavros Gakos. 31:27 video:
https://www.youtube.com/watch?v=ZoocbV20-VU
Previously:
https://www.homemadetools.net/forum/...2960#post97672
https://www.homemadetools.net/forum/...491#post135775
https://www.homemadetools.net/forum/...3437#post99090