WS 9: Replacing the main spring of a Rolex Caliber 1570
Here is the old spring removed. Please see this article of the Caliber 3035 on how to remove the hair spring. The white rectangle indicates the area where one could quite clearly see that the main spring is damaged. The curvature has been changed. This slight change in the spring geometry can make the spring useless. In the lower left corner is the new mainspring vacuum packed and held in compressed shape by a blue plastic spacer. This way of packaging will also allow you to insert the mainspring into the barrel without a spring winding tool.
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