I have a beautiful Pelikan 101N that I bought from a prominent collector a couple of years ago. When I had the nib and feed set by a well-known nibmeister, I was told that the nib had a small crack on the tail (not visible when the nib is installed). She cautioned me about trying to flex the nib, which is a nice OF. I write with a light hand, and I do not try to flex my Pelikan nibs--I just like a little cushion when I write. This nib provides its own line variation anyway. My question is, will a crack like this tend to worsen with use, even if the nib is not flexed? Should it be repaired to prevent this? If so, whom would the group recommend? http://i.imgur.com/4MOKSQQ.jpg