Presser foot compatibility labels do not all answer the same question. A broad mounting description can identify a useful starting point, while an exact manufacturer part number and model list provide much stronger evidence for a specific machine. This audit compares current official accessory and support pages to show which fields are disclosed, which are
Needle charts often look as if they disagree because they are not always answering the same question. One source may be naming a household needle system, another may be grouping needles by fabric, and a machine manual may narrow the answer to the styles and sizes expected by one model. This source comparison separates system,
The maintenance instruction that matters is the one tied to the exact machine, not a habit carried over from another model. In a fixed audit of five official records from Brother, Janome, and Singer, the permitted owner actions ranged from specific oiling instructions to explicit no-owner-oiling language, while cleaning and service boundaries also differed. The