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<p>[QUOTE=&quot;springfld.arsenal, post: 4375942, member: 54&quot;]<a href="https://www.flickr.com/photos/189102681@N07/shares/41s41i" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.flickr.com/photos/189102681@N07/shares/41s41i" rel="nofollow">https://www.flickr.com/photos/189102681@N07/shares/41s41i</a></p><p><br /></p><p>The thing, made of tool steel, is a one-off item, 3x4x 7/8 inches.&nbsp; The maker spent time making a custom box to protect it, and added the touch of “jewelling”&nbsp;&nbsp; I sent the pix around to our machinists club and no one knew for sure what it did.&nbsp; The key is probably the “knife edge.”&nbsp; He might have bolted it down to a steel plate with four precisely-located holes in it and used the knife-edge to precisely align some work- piece on top of that plate.&nbsp; But only he knows for sure and like a lot of this stuff, it only hits the market when the maker is no longer with us.[/QUOTE]</p><p><br /></p>

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