I present my pen refill adapter, for use in pens that used the Parker Fibre-Tip refill. It allows such pens to use the Mini/Multi D1 refills instead (not included).
The Parker Fibre-Tip refill is around 113mm long and 6.3mm in diameter. The D1 refill is around 67mm long and 2.3mm in diameter.
The Parker Fibre-Tip was a propriatary refill and is no longer manufactured, with working examples being very difficult to find today. While the D1 refill isn't an entirely practical refill, in terms of ink volume, it comes in many varieties, like the Pilot Hi-Tec-C Slims or Zebra JSB, so this adapter exists to hopefully inject new life into your favourite pens.
The adapter needs to be printed in the polished white or coloured plastics, as the smooth polished finish is functionally desirable. The D1 refill is held in place, by the adapter, using friction. The holes around the side of the adapter are present to help with the removal of unbonded plastic powder from the core, when being polished. However, some powder may still need to be removed, with a pin or thin metal rod, before inserting the refill.
Due to the very varied nature of pen design, I cannot guarantee that this adapter will work with any specific pen, although I've made every effort to make it as universal as possible.
I plan to make as many refill types compatible with as many host pens as possible, so If you have any suggestions on refill adapters, please let me know and I can hopefully make it available, depending on the relative sizes involved. I have now createdÂ dimensioned drawings of over 80 standard and obscure ballpoint, gel and rollerball refill types, so I like to think that I have a fair idea of what is and isn't possible.