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sorry jimijimi, I should have looked at the picture properly, it looks like those use something akin to a watch, a quick amazon search looked like each manufacturer does it slightly differently, but it is basically just pushed into the hole and held in place with friction https://www.amazon.co.uk/s?k=clock+insert&ref=nb_sb_noss_1 seems like it going to be very fiddly to set the time and change the battery, I would try and get some nice deep / thick ones or it will fall out very easily