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I can't grip it in the chuck securely without marking it.Turn a bullnose center in the chuck and use a dog on the barrel to turn it between centers. Make a simple clamp dog like this one.
Actually, thinking a little more about it, do you already have a center drilled hole you were going to cover with the welded on cascable? If so, use that, then weld on the cascable.
There is a chemical process or two part system thats sold under the name "tool black". Leaves a black oxide finish similar to that found on pin wrenches. One part is what I believe is actually the tool blackening solution and the other is the preservative. I used to get a british machinists magazine and I believe its sold by G.L.RDistributors LTD unit C1 Geddings Road Hoddesdon Herts EN11 ONT Web Site www.glrmodelsupplies.comTel 01992 470098. They list it as KOOLBLACK good for steel, cast iron and iron. Simple immersion at room temp, permanent heavy duty blackening. The name of the magazine is model engineers workshop. Hope this helps. Frank