Omega Watch Pin Not Screwing Back In

[nabz]

Hi,

I have the following two Omega Seamaster watches but both of the pins of the watches where I can change the time and date is not screwing back in. I don't know if it's the spring that's gone but I am willing to purchase the parts for the watches to get it fixed - but can someone please guide me to where I can buy these parts? I asked the seller from whom I bought the watch from but he has told me that both of these watches are out of production?

Can someone please guide me on how I can get the parts please? Photo attached for reference.

Thanks,

Nabz.

PS. Sorry if I have posted in the wrong thread.