I have several 4" x4" wood posts, with one single piece of steel wire going through each post.
Is there anything I can use to tighten and secure the wire in each post?
The first and last post will have a regular hook for the wire.
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The tool you are looking for is a wire stretcher.
Have tightened or stretched many types of fencing over the years, never bought a stretcher...
We would get two 2*4 of a suitable length (just longer than the fence height), then drill and fit 3 or 5 bolts that would clamp them together. A couple of holes for the rope or chain to go through and we were ready.
Clamp the fence between the 2*4 and tighten the bolts. Then use a rope or chain for a handwinch or spanish windlass to pull on.
If the first and last posts are not strong enough they can be pulled out of the ground.. We had our corner posts set in 5 foot and bracing as necessary.
The wire is secured at the start and the end but only loosely fixed in the middle posts so it cannot get pushed down by the cattle - but allows movement horizontally. We used wire staples for the middle fixings.