Historyworker
Member
- Joined
- Sep 11, 2023
- Messages
- 22
That's a step forward guys, thank you.
Those are a type of woodworking clamp, but unfortunately that is all I remember about them. After I went through some additional threads, it finally came to me that I had seen those used as miter clamps and confirmed it by searching for that term.
You're welcome.That's a step forward guys, thank you.

Duplex aliquot adjusting LOL.I think it is a piano tuning tool (called a hammer). Yours appears to have 8 point socket ends for the square tuning pins.
Check out this site.
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Antique and Vintage Piano Tools II - Martin Shepherd Antique Piano Tools
ONLINE MUSEUM OF ANTIQUE PIANO TOOLS My interest in antique tools goes back to the late 1970s in Boston, even before my first commercial piano servicing work. In 1978, I took a risky hitchhiking trip from Boston tomshepherdpiano.com
This image is taken from there.
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Thank you! What would it be worthDuplex aliquot adjusting LOL.
No idea. Good luck bro.Thank you! What would it be worth
You now know what it is - go look up sole listings on Eprey.Thank you! What would it be worth
According to Google:
But the picture looks nothing like that, so I suspect someone bastardized it when it broke.According to Google:
"U.S. Patent No. 6,678,959 is a granted utility patent titled "Grout removal tool". It was issued on January 20, 2004 (filed on April 27, 2000) to inventor William Phillip and assigned to Midwest Trade Tool, Inc.. The tool—often commercialized as a reciprocating saw attachment for clearing tile grout safely—is designed to fit between tiles to remove old grout without chipping or damaging the surrounding tile edge."

Interesting, I didn't go so far as to look at the drawing, my bad. Could be someone modified it after the fact.
I can't see where the patent or Kobalt markings are, but kobalt on the saw blade bit makes sense. If the patent is on the clamp bit, also makes sense that someone bastardized it together, possibly just to mess with people.Only marking is KOBALT &
pat. 6,67,8,959
I'll be damned, I swore I was seeing a socket on the end, for taking a nut off, not for sliding and holding a shaft. I have a couple of brushes for my recip saws but they all have the standard saw end. Nice work picking thru the clues to find it.