surface grinding

Just wanted to share a clever solution to a seemingly difficult problem. I know I've seen this somewhere before onlin, but got a real up close look of thin magnetic clamps for odd shape or delicate work. For proprietary reasons, I cropped out all of the important stuff. Left the common...

Warning: I tend to over-analyze and write a lot. :) Terribly oversimplified version: What is the cheapest way to hold an item for surface grinding when the opposite side is not flat? I inherited a surface grinder, as detailed in a vintage machinery post a while back. I don't have a mill and...