That's interesting. Thank you. I cannot be sure but I think the crystal is now fully home. Time will tell when I take it swimming!
Progress so far:
I have swapped the day wheel and movement gasket over to the new movement and fitted the dial. The day wheel now lines up with the date.
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Fortunately the circlip that holds the day wheel down is not very tight, so it didn't ping off into orbit! Unfortunately the small white plastic day cog that moves the wheel also came off. I wasn't sure what way round to fit it but a quick look at youtube solved this. Now I have had enough for tonight! Next stage is to fit the new hands.