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| With the 2bys hard wood works well but you will need several bolts the length of the board. About a bolt for every wire. With battery powered impacts this will work good. If you build one for further use its a good idea to drill the bolt holes in one piece so they fit tight and stay in that piece. Stagger the holes side to side so the board doesn't split. You use the first piece for a pattern but drill the other piece with over sized holes and use heavy washers so it won't be hard to put together and especially take apart.
Like one post mentioned the corner may give a little if its not the anchor for stretching. What I do is cut the wires individually while still tensioned and leave the top wire till last. That way the post has been tensioned some and you can pull that wire in some when you wind it around the post.
When stretching you don't want to pull the tensioning curves out of the wire as these are supposed to keep the wire tight due to temperature changes. About all as 30 hp tractor will pull is about right. A 4 wheel drive bobcat can probably over stretch it if its very big.
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