Rules and Practice for Adjusting Watches

by Walter J. Kleinlein

[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.

CHAPTER IX