A named craft tool / part lemma (Silver Chains Are Burnished) drawn from public-domain workshop speech (metals / japan-polish / carriage / pottery / glue / paint / turner / hat / soap / mend).
Silver Chains Are Burnished is historically related to Iron.
silversmith-handbook seats orphan silver-chains-are-burnished beside iron as a first craft peer — object speech, not a text-container or tradition dump.