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Hello, fellow FPN'rs. I received my Moonman M2 eyedropper a few weeks ago and have been very pleased with it. I posted a review here. However, I just can't get used to the Extra Fine nib it came with. The nib is fine, just WAY too thin for me! So I bought a couple of nib replacements from Bobby Pen on eBay. One is a gold coloured steel FINE nib and the other a plain steel MEDIUM nib. They are cheap, so I thought if the fine wasn't thick enough, I'd just slap in the medium instead. Easy peezy right? Not so much! First, I found a YouTube video from Mr. Bobby himself, going over the process for replacing the Moonman Wancai nib which is the same process as for the M2. Here is his video: So, I prepared myself to do this carefully. I had read on Reddit where someone had a really difficult time removing the M2 nib and ended up using pliers and destroying the feed. I like to think I'm not that dumb, but I made sure I took my time and was extremely careful. At most, I'm wrecking a $20 pen, so I wasn't too scared. I took video of the whole process. It was difficult but not impossible. Using Bobby's technique of grabbing the nib by the shoulders and wiggling it side to side, I finally got the nib to start to move and was able to get it out of the feed assembly. Putting the new feed back in was dead simple by comparison. The thing that you have to really watch for is the small silicone ring at the back of the feed assembly that just falls off. It is so small and so transparent, I'm lucky I noticed it. The other thing I found was, you have to be careful about the orientation of the nib when screwing it back into the feed (as well as ensuring the back O ring is properly replaced), because the nib won't line up with the "Moonman" band if you don't put it in properly. I was able to twist the nib just enough to get it lined up again. The FINE nib is much better than the EF. I will write with this for a few weeks to see if I need to change it out for the medium. I hope not because I like the look of the gold nib over the chrome. I hope you enjoy my geeky little project!