I bought my fountain pen from Ranga pens. Its an Abhimanyu model in acrylic with a #6 Jowo nib. This pen feels very comfortable in my hand and I'm planning to upgrade it to a titanium nib since I want to try one. As per my limited knowledge Bock is the only supplier of titanium nibs. But I don't know if a bock nib unit will fit into a pen threaded for Jowo nib. I got this doubt because on the website thepenworld.com they have Jowo compatible nib units separately and Bock compatible nib units separately, both made by Kanwrite. So I was wondering if there is difference in them both. Can anyone advice me on that? Is it possible for me to upgrade this pen to a titanium nib or I have to purchase one more with a titanium nib?