Sliding T-bar. By Mr. Deswal. 4:10 video:
https://www.youtube.com/watch?v=SBYvxt_9YA0
Previously:
https://www.homemadetools.net/forum/...257#post176902
https://www.homemadetools.net/forum/...114#post172327
https://www.homemadetools.net/forum/...955#post167991
https://www.homemadetools.net/forum/...258#post154090
