Unresolved catalog conflict — the docs and the parts calculator disagreed when their catalogs were merged (2026-08-21):
M3 heat insert count: docs say 7, the calculator says 9.
docs: 4× hsi-m4 + 7× hsi-m3-long · parts-calculator: 4× hsi-m4 + 9× hsi-m3-long
Section 3 of 3 of the top interface split spur gear (Spur 2M 120T).