Sorry for reviving such an old topic, but I recently had the same idea as the original poster. In my case, I thought I wanted to try the untipped Noodler's calligraphy nib on my Jinhao X750, since I prefer italics to tipped nibs. I ordered the nib before I found this thread. When it arrived in the mail, it turned out they had sent me a fine non flex nib instead of the untipped nib. Since the nibs are so cheap, I decided, instead of returning it, to try grinding it myself. I kinda messed up at first, but I kept grinding and I ended up with an untipped stub-looking nib, that looked to be about a 1.5
I tried fitting it in my X750, but as a previous poster said, it turns out that the Noodler's nib is made of thicker metal and would not fit properly: it would not go all the way in and nib and feed were squeezed together at the base and gaping apart at the tip. I then tried fitting it in my X450, and it fit! It went all the way in and the feed and nib only had a very small gap at the tip. The monochrome Noodler's nib did not look all that nice in the X450 though, and I set out to investigate the difference. I tried swapping feeds and nibs between the X750 and X450 and I concluded that the feed of my X450 (marked with a 2), although it looks identical to the feed of my X750 (marked 3), is actually a bit narrower, leaving a bit more space for the thicker Noodler's nib. On the other hand, the section inner diameter was identical on both pens. So I fit my X450 feed and the Noddler's nib on my X750. It took some force to push them all the way in the proper position (making it very hard to actually remove them again), but they went in and fitted tolerably with each other. There was a very small gap between nib and feed at the tip, about 0.1 or 0.2 mm. The pen wrote a bit dry, so I decided to try heat setting the feed to the nib. Plastic feeds apparently can be heat set, but it is a lot more difficult than for ebonite feeds. The first couple of tries I did not accomplish much... but the third time, I tried pushing the tip of the feed towards the nib, while I had them submerged in boiling water, and held them there for 30 seconds... and voila, a perfect fit! Ink flow improved a bit, but not dramatically, though. The pen puts down a line thinner than the nib, closer to what I would expect from a 1.1 italic, but I think that this is in part due to the more rounded "stubby" shape I have given the nib to make it smooth, and only partly to the dryness. Still, it has GREAT line variation, with the "thins" being very thin, as the nib tip is not thickened, like on manufactured italics (it actually took some doing to smooth it out enough not to cut the paper like a knife).
So here is the pen and a writing sample:
Ink: Pelikan 4001 Brilliant Black Paper: Fabriano MultiPaper
Edited by sapient, 11 November 2017 - 10:10.