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Spring Bolts

A named craft tool / part lemma (Spring Bolts) drawn as an exact public-domain workshop phrase.

Spring Bolts is historically related to Iron.
watchmakers-handbook seats orphan spring-bolts beside iron as a first craft peer — object speech, not a text-container or tradition dump.
from Claudius Saunier (tr./ed. PD) · The Watchmakers' Hand Book, PD Gutenberg #76850
historically related to · sourced · documented

sources

The Watchmakers' Hand Book · Claudius Saunier (tr./ed. PD)
Claudius Saunier, The Watchmakers' Hand Book (PD Gutenberg ed.).