I recently picked up a Monteverde USA Tool Pen Inkball (assholes making that name so freaking long...). The pen is, uh.
One of the worst pens I've laid hands on
I cracked the box open, discovered there were no ink cartridges or adapters and... it didn't get better once I ordered a converter and some standard international mini ink cartridges.
NOTHING I've tried for ink cartridges or adapters fits in this pen. At all.
The tip of the pen where the cartridge / converter would plug in is a soft plastic and I've already over tightened it to the point where it can be twisted freely with minimal force.
I haven't written with this pen and I already want nothing to do with it.
I'm not going to bother any further. If you want it there is a contact form, send me a note and if you're willing to pay shipping, it's yours.