If the end of the jump is happening at 58 seconds, parts don’t necessarily need changing. The finger that controls the jump which is on the under side of the chronograph runner can be moved to change the timing of the jump.
Omega reference this adjustment in their technical guide, however, they do not offer a solution.
You can use a 0.8mm screwdriver blade (preferably something softer) to move the finger around which controls the jump. It can be set very close to the exact 60 second jump.
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