My Peugeot is from the 70's so its drop-out is not normally compatible with a Campy derailer, hence the "Road-link" which I would rather hack about with, than the actual frame. I just ground off a bit of the tab with my electric drill and did it up good and tight.
Hopefully it will be a useful addition for Eroica Montalcino.
https://www.wolftoothcomponents.com/products/roadlink
https://www.aliexpress.com
Disraeli-Gears