What Is It? Clamp? Tool Stop?

[fasteddie]

I've had this thing lying around for many years, never knew what it was for. Looks like a stop or indicator pointer that clamps on a dovetail shaped bar. Hardwood with brass threaded rod, knurled brass knob. Looks like it might have had a nameplate where the 4 holes are on the back.

 

[454ragtop]

Looks like a stop for the cross slide on a lathe, sometimes used when threading.

 

[NJ Marty]

Kinda looks like a tool holder for a cross slide vise.

 

[Ecosta777]

Threading stop for a lathe. Mounts on the cross slide ways and allows you to bump the cross slide against it at zero instead if trying to dial back to the correct zero when threading.

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[humber2]

Could be a clamp to hold a brake lining to a shoe in position for riveting.

 

[readhead]

I have a later version just like that made out of aluminum. I think there are some pieces missing and they come in pairs. It is half of a set of trammel points for laying out circles. You supply your own stick with similar bevels on both sides. It looks like there is a scribing point that is installed upside down.