Pillar climbing shoes. By Mr. Deswal. 6:56 video:
https://www.youtube.com/watch?v=EN4Cup5WegY
Previously:
https://www.homemadetools.net/forum/...114#post172327
https://www.homemadetools.net/forum/...955#post167991
https://www.homemadetools.net/forum/...258#post154090