Now, with the participation and great help of the vendor of this very pipe,Tabacceria Corti-Italian pipe shop(Mr Luca took over and did monitor the whole process, then collected the pipe at the Castello manufacturers and had it shipped to me in (sic!)one single day,a man could not ask for more that's for sure.As for the repair itself, I'm pretty satisfied with the results,the only one thing which I'd like to have seen a slight taper to the new stem which is now absent,the original one was slightly tapered as You can see at the pictures,otherwise I have no complaints, the transition is smooth, button well shaped,drilled perfetto,and all this for 70e, judge by Yourself,Thanks for the comments.And Yes,the shank remains untouched.