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@gfk_velo
Unfortunately, that screw isn't available as a spare part and simply replacing it won't necessarily put your RD back into working condition, in any case - part of the reason it isn't available, even to us, as one of the two Campagnolo Appointed Service Centres in the UK.
At the top of that screw is a crown gear that engages a bevel gear, which changes the spring tension at the top pivot bolt as the RD tracks across the cassette (the "Embrace" gear). If the crown gear and the bevel gear fall out of synch or alignment, either the Embrace system doesn't work properly or the gear develops one or more "sticky patches" in it's travel and doesn't index correctly. Once that screw is out, there's nothing keeping the crown and bevel gears aligned / synched.
I have to say, this is the first time in the 7 years of the Potenza group's presence in the market, I've ever seen that screw come out. The head is deliberately made so that a mechanic or final user can't easily remove it, for the reason given above.
If the gear is still within it's 3 year warranty period, you are the original owner and you have a proof of purchase, you could submit a warranty claim, either directly with us or via Chicken Cycle Kit - that's probably going to be your best course of action.
If you need to carry this further with us, please either use the technical help emailing system at
https://www.campagnolo.com/WW/en/contact_us
And check the "End User" and "Technical" notes in the email form dropdowns. It'll be forwarded to me at Velotech, or answered directly by the factory (far more likely it'll come to me though).
Alternatively, please mail me direct at velotechcycling"at"aim"dot"com