I see a power cord so I suspect (just a guess) is is similar to the ones I used on paper shells when I was a kid. The ones I used had a heated mandrel that slid inside the case. It melted the wax that was left in the paper. The shell was inverted allowing the melted wax would run down into mouth of the case giving a nice crimp. MEC used to sell them. An additional benefit was that if there were any pin holes in the paper you could see the hot wax/gas escaping and could discard the shell.
C.G.B.
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