Turnbuckle wrench.
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Previously:
https://www.homemadetools.net/forum/...224#post195929
https://www.homemadetools.net/forum/...433#post192832
https://www.homemadetools.net/forum/...277#post192208
https://www.homemadetools.net/forum/...103#post191533
https://www.homemadetools.net/forum/...029#post145111