ya
lead slug with the center hole for the thru wire I'd imagine
some plugs like the mureels used a 3/16" diameter lead a few inches long put in the front part of the back half, and were placed under the thru wire therefore didn't need a hole down thru it.
you can buy pencil lead in a roll that has a hole in it but it is for fishing line not big enough for stainless wire we use, maybe your diagram refers to the weight as that.
You are over thinking it maybe
just go by what it says and I bet it will work out as long as there is some idea of dimensions.
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