How to make a reverse curve in sheetmetal. By Wray Schelin. 10:07 video:
https://www.youtube.com/watch?v=zmDFcOJvRqw
Previously:
36 Best Homemade Metal Benders eBook
https://www.homemadetools.net/forum/...682#post182674
https://www.homemadetools.net/forum/...136#post176437
https://www.homemadetools.net/forum/...210#post157832