One month ago I bought some very cheap black Hero 616 (Jumbo). I read lots of good things here and on the Web and, indeed, they write well but not as good as the gold nib of my broken Hero 100. So, I wondered might I replace the steel nib of a Hero 616 with a gold nib of a Hero 100?
I disassembled a Hero 616 by following this picture tutorial, I extracted the 14Kt gold nib of my broken Hero 100 (unfortunately, to do this I had to cut the grip section but the pen was already unusable) and, yes, the two nibs were very similar as I suspected (a part from a small tooth in the body of the gold nib that I removed by a pair of pliers). Then, I assembled the new 14Kt gold nibbed Hero 616. I filled it with my favorite black ink (i.e. Aurora) and I used it and it writes really well as expected!
The plastic body of a Hero 616 is worst than the plastic body of a Hero 100 but its dimensions suit better for me. The shape and the dimensions of a Hero 100 are practically the same of the ones of a Parker 61 (I own one, I compared them side by side) while the shape and the dimensions of a Hero 616 Jumbo are practically the same of the ones of a Parker 51 (I own one as well). The Parker 61 is smaller and thinner that a Parker 51 and I prefer the latter.
Here some pictures of the process of nib replacement.
Edited by mbSailor, 25 November 2011 - 22:23.