I never was happy with the lateral wobble in these chairs. None of them have broken but I didn’t like the side to side play. A friend of mine suggested a design change which worked very well. I have edited my previous post to reflect these changes. With pictures for those of you who buy magazines for the articles! Go to my project page, click on folding chairs, cutlist, etc to see new design. Hope this helps you all.
-- " I'll try to be nicer, if you'll try to be smarter" gfadvm