Edgar, the so-called "pack" reamer was used for slow scraping or burnishing of the bores and chokes. It cut away very little metal and left them with a smooth surface and ready for the polishing rod. See attached pic which may be greatly expanded.
For info, this and my preceding reply are excerpts from my second to last DGJ article which was in the Summer 2022 issue when its plug was pulled. I requested both to be returned, and some day I may find another publisher for both.
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