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I think it's the chuckhead to the universal trimmer. Is there an orange sort of mini lath looking item lying around? If there is, it may be missing this part. There would be a hole in one end that would go into it and a nut spun on to the protruding threads. When its locked in, rotating the head using the attached lever will loosen or tighten the shell.
It would look like this: http://www.lymanproducts.com/lyman/case-trimmers/universal-carbide-trimmer.php |