CHAPTER VIII

Relative Pinning Points of the Hairspring 43

29. Original Springing of Watches. 30. How Pinning Point Alterations are Made. 31. Even Coil Hairsprings Very Incorrect for Some Watches. 32. How to Find the Correct Collet Pinning Point for Any Watch. 33. Results in Vertical Position Rates due to Changing the Pinning Point. 34. The Natural Position Error and Why it Cannot be Eliminated. 35. Principle of Pinning Point Alterations. 36. Same Principles Apply in Case of American Hunting Models.