WS 9: Replacing the main spring of a Rolex Caliber 1570
Here is the watch that would not fully wind. After about a quarter of what you would call a full manual winding, the main spring started slipping. At least that was the feeling and sound noticeable. Also the reduced power reserve of 8 to 12 hours definitely pointed into that direction. Something with the main spring was fishy and it probably needed replacement.
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