I have this custom pen I bought forever ago and can't contact the original maker. The image attached is the tip that I was able to unscrew from the barrel, but not sure how to get the ink tube/tip from the part with the thread. I tried unscrewing but I can't get a good grip without crushing the tube. I tried pushing the tube out, but again not too hard. Do you have any idea how I would refill or replace the ink?

I hope you can see this image. I don't have a url for it, so I made an attachment. This is my first post. I'm not an official pen geek.