I am working on a 1.5m satellite dish with a custom feed. The problem is that the feed is being very wobbly once slightly pushed, as shown here: https://www.youtube.com/watch?v=rAFGbEhhDZ8 (it swings back and forth, which would not be a good thing on a windy day).
Would adding a second thick plate to the back of the feed (where it's held on by the threaded rod (24M)) make the feed any stiffer and reduce/stop wobbliness? I had this problem with my previous thin rod (see Stopping/reducing wobbliness in threaded rod), but I fixed it by increasing the diameter of the rod. What could I do with the feed?