Lower leading edge, The fact is that this part has broken, I have ordered a rod of the same size, but I am still not very familiar with the repairs or with the loose parts, I have the original ferrule and a rod of the same size, at first glance it seems simply a hollow rod that reaches the ferrule, then inside another rod that goes inside it to the ferrule, then it has a kind of hole through which a mini rod goes that fixes it, no idea, in principle being like that, it could fix it but, it's weird.
This is the part where the rod is filled