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It's easy to do but hard to get right. There are no adjustment markings to work to, and no mechanism for fine adjustment. So it's shove and hope, repeat, repeat..... Probably the worst aspect of the whole watch from an enthusiasts perspective.
+/- 5s /day is possible with the movement.
You can find apps that will allow you to regulate, but none I've tried could hear the watch.
Good luck, please pass on any tips that you pick up.
The.Gren
Ever the meddler, I'm wondering if it's a good or bad idea to try to home-regulate a Seiko 7s26c movement. It's losing 25s and word on the web is that's not far outside average, though most seem to gain when new. Dive in or leave well enough alone?