“Do you not know that a man is not dead while his name is still spoken?” - Terry Pratchett, Going Postal
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Hello, I am going to take a guess without seeing it. Sounds like a Machinist's Jack Screw. Here is a link to an ebay item that might be it. I imagine the locking bolt would be there to ensure against movement once dialed in. https://www.ebay.com/itm/Vintage-Mini-3-Machinist-Screw-Pedestal-Leveling-Jacks-lot-of-4-Armstrong-Bros/372646137033?hash=item56c370ccc9:g:deMAAOSwcwdczx~F Regards, Lou