Nib Black Steel

Dear Stilform team! First of all: creating something new is usually not as easy as "copy paste" something that has been done by other companies before. I have big respect for what you guys are doing from a design perspective, and the very professional way you handle what I would call some "ramp up issues". Many thanks for that! I received my black pen / black nib last week... and I can say one thing: it was worth the wait and it is beautiful!!! I love writing with it, and it creates a smile on my face every time I look at it on my desk at work. :-) I have one question: I figured out that the M nib I bought is a little bit too "broad" or a bit broader than other M nibs I had before. That was my choice, so I do not expect any replacement or what so ever. I was just wondering how could I buy an additional (fine) nib? I looked on the Peter Bock Website, but I do not know which model fits to the stilform pen, and there is no way to order nibs directly from Peter Bock. Is the nib a special product made for Silform only? Any help on how to buy an additional nib is welcome! Thanks, Max