These are steel refills and I used a Dremel tool with cutter disc, but maybe it could be done with a fine-toothed Junior Hacksaw or with a fine Needle File; afterwards deburr the cut with emery paper.

Linc Safron Max Gel Pens | Black Ink | Pack of 5 Smooth

is the exclusive importer and distributor of Asia's biggest stationery giant, Deli and world famous pen brand Uni-ball, Mitsubishi Pencil Co. Also you can dissamble a cross century refill, remove the plastic cap on the top, and with a pliers make some presion to create the stop, it's a bit long but.One of my Linc Axo rollerballs with biro type ink I have converted to a Gel pen with a Linc Safron Max refill cut to the right length. Perfect for kids and adults writing hobbies for it sets fine lines suitable for small details and writings. B>18 pack of black gel ink ballpoint pen: black gel ink pen come with a Retractable design, and you can hold it for a long time to writing something with the rubber gripes on the tube.

Linc Safron Max Gel Pens | Black Ink | Pack of 5 Smooth Linc Safron Max Gel Pens | Black Ink | Pack of 5 Smooth

Yeah, I know it is "just a ballpoint"; but this pen happens to be solid 14k gold and in mint condition. We sometimes take for granted just how often we need and use pens in our daily lives and the moment you desperately need one, there never seems to be one to hand. However, none of the disposable ballpoint refills that I have tried are thin enough in the writing tip to fit through the barrel opening of my pen. Just for the record, I've just changed the Refill in my Kaweco 619 Ballpen (which often comes in sets with Kaweco v12 and v16 Piston-Fillers) They're the 50's and 60's forerunner (but smaller) of the modern Kaweco Sport. They don't have a ridge for springs since the Visconti doesn't use springs, but the length may be right and you can always add something if you need a ridge.The quality of the external and internal material is good with the newly developed advanced ink, writing more smoothly, and a pen you can use for a long time. Anyone with a mild obsession or even just passing interest in stationery knows the joy of a good pen. A suitable replacement refill is Schneider Express 75 M (ISO 12757-2-A2) which will need to be cut-down to 93mm length. It would be unfortunate to see a beautiful pen damaged or dissolved by cleaning with the wrong supplies (especially since you mentioned that your friend was a "clean-freak". Ball-point pen ink is essentially printers ink and very viscous, cutting down the refill will not cause it to leak.