Thread Wizard

Spinning the bolt against a hand held wire brush in the fixture,,
instead of the more common method of holding the bolt against a spinning wire wheel mounted on a bench grinder or in a drill.

What ever is more handy for your particular type of work I guess.

Probably works good, but I have personally never tried one or even seen one in hand.
Most of the stuff I work with is likely too small for the tool (gun screws).
I get by with the wirewheel on a motor mount and the ends of my fingers get a good cleaning as well by the time I'm done.
 
Another gizmo no one really needs, but their market is directed toward the gadget-oriented.
 
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