Hi Destry:
Mine is a UMC so it apparentely was made from an original all brass shell. I had to clean the base a bit to make this out. The shell of course is standard size and stays in the chamber while the tool is in use.
Have you or anyone on the Forum ever seen one of these still in the original box?
I shot an additional picture with a period wood rod attached so everyone could see what it would look like while in use.
Jim



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