mainspring cracks vs cosmetic marks

Apparent cracks on a mainspring are usually cosmetic file cuts or manufacturing marks rather than structural defects. A real crack would have caused the spring to fail already under tension.

Topics: Products_KitsTags: Manufacturing|Mainspring|LockLast verified: 2026-08-15Also called: manufacturing, cnc, cnc machining, machining, milling, how it is made, mainspring, main spring, v spring, vspring, lock, lockplate, lock plate, lockplate assembly, lock assembly