I've inherited an older Campy rear derailleur and it is missing the "Multi function insert". I'm assuming there's not enough room for plastic to not shear off when engaging the teeth, but figured I would ask the experts. This little piece served the same function as a Shimano B screw, rotating the derailleur back for bigger cassettes. I'm guessing you could print a part to fill in the entire recess and teeth to stabilize it and fix it in 1 position? The insert is still available for 40 to 50 bucks, but I'm not that in love with this derailleur.