Hollow shaft nut driver.
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Previously:
https://www.homemadetools.net/forum/...015#post198992
https://www.homemadetools.net/forum/...027#post195057
https://www.homemadetools.net/forum/...931#post175666
https://www.homemadetools.net/forum/...889#post164060
https://www.homemadetools.net/forum/...855#post175335
