a block of metal with a section cut out so you can see the long
bolt that screws almost the entire length with a very long handle.
The bolt has a curving section cut out of it. -
I have a tool similar to this. Mine has the original threading tap
in the hole rather than a grooved bolt. Threading taps have 3
undercut grooves already in them, they are made of hardened steel
and are very sharp.
Mine also has a shallow recessed groove milled on the flat surfaces
of the cut away section. The recesses are different widths on each
side and run the full length of the block parallel to the tap.
Anyway this is an old Native American Silversmithing tool used to
make your own serrated bezel from either plain bezel strip or
heavier gauge fine silver strip that you have cut yourself. (I like
Place the block in a vise. Place a strip of .999 silver that has
been cut to the proper width on the flat surface parallel to the bolt
or in my case the thread tap. Align the bolt so the strip extends
inside the groove when it is on the flat surface. Hold the strip
firmly down with your fingers or a piece of wood or plastic and crank
the bold down with the handle so it shears off the edge of bezel
leaving it serrated. Move the strip further along the block - make
sure the previous serrations are aligned with the bolt and shear
again. You can repeat this process until you have the needed length
of serrated bezel.
Its a very ingenious and handy tool. It just takes a little practice
to keep the serrations from getting overlapped. Thats why mine has
the recess, it allows me to align the strip easier and keeps it
parallel in the tool. The different withs accommodate different
widths of strip.