Hi strinos, I'm surprised that you've been a member here for over seven years but you didn't know about Rolexman and MD2020.
Both are fantastic watchmakers.
If you are based in the EU, then Rolexman would be your best bet. He's based over in the Netherlands and is very busy so you'll need to pm him to request a time-slot. I am not sure what services Rolexman offers besides servicing however you can ask.
If you are based in the States then MD2020 is your man. MD is based in Chicago and does everything, and from what I hear, he's superb!
If you are based elsewhere then I'm not too sure.
Hope this helps mate.