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I was thinking you wanted to repair threads in a casting. My oversight. As far as the 2 wrench mode, it will work if done carefully. Some of the kits have a hex shaped tool with a serated nose that keeps the insert from spinning while a hex wrench tightens a screw that neatly collapses the insert sandwiching the parent metal.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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