Hi all. I am wondering if anyone out there knows of a source for Hero 616 nibs or a nib that will fit the 616. I would like to get something other than the fine nib that is on all of these pens. Ideally, I would like to have a medium-fine stub... if I could find one. I have seen a "lot of 5 nibs" listed on Ebay but, of course, they are the standard fine nib. I suppose I could just grind down the standard nib and do without the tipping material but before I do that, I thought it a good idea to toss out the question to this worldwide forum.