Thank you for this awesome reference guide! He will also work to make a custom 3D printed sleeve to meet your needs if you email him directly. These means the Parker adapter will likely not work in the pen you wish to adapt. It most likely would be friction, but with a D1 refill’s narrower body and even narrower stick section, it may not work as intended. So I use a lot of D-1 refills. So.. if you had any advice on where to go or whether I am going about this problem all wrong, I would be so grateful :\ . $5.50 . $2.25 shipping. I bought my fiancé one for her birthday and she has already burnt through the one that came with it. I love the smooth feel but unfortunately, I am a student in exam season, so I’ve been going through at least two refills a week with essays and revision and whatnot. At the same time I think I won’t find anything smoother! Thanks! Schmidt Easyflow 9000 refills are manufactured by Schmidt in Germany. I must say, brilliant job and thank you very much. I’m a convert to really bold point gel pens I have a few nice Waterman ballpoint pens and would like to convert them to gel bold pens. I’ve got one in an Acme right now and it’s okay, but I’d like to put it in something else, too. Sure you can pop the endcap of a MB Rollerball refill with pliers and syringe-fill with fountain pen ink, but why go to the bother when you can get a superior writing experience with less effort? These refills are suitable for every rollerball and ballpoint pen that uses the international "Parker" standard. I believe the cap on the end of these slotted refills can be popped out. Old-Model Kaweco “Sport” ballpoint pen:- EasyFlow 9000 – Capless Parker G2 refill with hybrid ink. From my own cursory research, it seems as if these pens are no longer made. Try this one, and if you order $25 or more, shipping is free. Waterman Ballpoint Refill . 95. You may want to pop out the refill and take a look at it and double check. You’re right to fear that other Parker style refills might not fit properly. I have a Safari rollerball. Looks like the MB roller is the same sized cartridge too. It fit very well onto the end of the VBall refill and I will just need to transfer that spacer to any other VBall refill that I use. Schmidt 9000 Easy Flow Hybrid Ballpoint Refill, fits Parker ballpoint pens, Medium, Black, 2 Pack (SC58143) Price unavailable. RED pens never work! Otherwise, I’d recommend just sticking with the rollerball refills. I guess my budget is