Quartz Watch Servicing/Replacement

This is my grandfather’s everyday watch he wore late in life until his death. It has a late 80s, early 90s Longines quartz movement that struggles mightily to stay running. I really don’t care if the movement got swapped, i just don’t want it to be hurt in the change. The second hand is what seems like a plastic disk that moves the train around the track. Any advice is helpful.

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