Remember the Tightening Thingy that stopped tightening my easel?
I was unsuccessful in finding a bolt with the correct threading.
Partially because I need to keep looking and I haven't.
Then I had a Brilliant Lightbulb Moment when I realized there is another exact tightening thingy on the back of the mast! I swapped them out. Now the front tightens again, AND the stripped Tightening Thingy isn't stripped where it needs to tighten the back so it all works!
WHY. Why didn't I think of that sooner.