those are interesting, never seen them like that. I only knew the term rock jack for line postsThey are call rock jacks here. There are lots of them. They come in various forms but all the same theory. Something to hold a stack of rocks which holds the fence. Here is a couple on the sides of a gate made with lumber. And another in a property corner made with Juniper which would have been cut near the site. I see then made with the wire basket, with wood the most common, and I have seen them made of welded up scrap iron. I have a neighbor who constructs then out of old bent Tee posts. I have couple that I have made that way. Some of the rocks I see utilized were put there by men a lot stronger than I have ever been.
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