*** We only officially accept Eureka ultem ink cartridge as main ink storage device for our pens.
We no longer officially recognize Con-70 / Con-40 as converter for Eureka fountain pen models.
Although they are still compatible, you must read con-70 related manuals / tips before using them.
It is tricky to get it right, although if you are skilled / experienced with the system, it should be fine.
For those having difficulties getting it to work properly, we recommend the machined ultem cartridge instead.
also, because of the way Con-70 was produced, external surface is not consistently accurate between batches / not perfectly round.
So some of them may require "taming" by wearing the external surface down to match eureka grip part.
This is only problematic for fitting into eureka grip section, which uses external surface to seal (as opposed to internal surface).
Hello, this is Fountain Pen Research.
Today I wrote about how to use pilot cartridges, which I recently started researching.
When I developed the grip section, the target was CON-70 / 40.
Therefore, since I did not know much about the cartridges at the time,
I manufactured them without considering them.
Because of this, it may be difficult to install in typical fashion,
so I created this tutorial.
This is what the pilot cartridge box looks like.
There are 5 in one box, and the price of one box is around $1 ~ 2.
Therefore, each cartridge costs 20 ~ 40 cents.
Very economical
This is what the cartridge looks like and what the Eureka grip looks like.
(Ebonite feed compatible grip)
If you zoom in on the end of the cartridge, you will see that it is slightly flared outward.
It looks like the deformation probably occurred during injection molding.
This is because the closer you get to the entrance, the thinner it gets.
The end is flared so it is not easy to insert.
Fortunately, the cartridge is made of soft plastic.
First, tilt the cartrige and try to insert it (keep tilted position).
If you apply more force, most of it will fit in as shown below.
Some part of it will not fit as shown below.
At this moment, push it in by pressing it with your thumb nail as shown below.
Once the whole thing goes in, rotate & push deeper.
Here's how to remove the internal lid.
a new cartridge has a lid blocking the entrance as shown below.
When pushed with a toothpick, the lid rotates half way as shown below.
ink may splatter, so proceed carefully and slowly.
Remove the rotated stopper with thin tweezers.
If you don't have tweezers, use two toothpicks like chopsticks to remove them.
If you clean the cartridge, it will look like this:
Inject ink of your desired color with a syringe.
The cartridge's advantages are as follows:
1. Very cheap (20~40 cents per unit - excluding shipping costs)
Amazingly, for the price of one Con-70, you can get about 20 cartridges!
2. Easy to replace.
jsut like a ink converter, it is easy to replace, making self-maintenance convenient.
3. The ink capacity is quite good.
It's not exact, but it's on par with Con-70's capacity.
4. sealing strength seems to be better than Con-70.
It seems to have a better sealing ability because it is softer than Con70.
(If necessary, a small amount of silicone grease can be applied to the mating area)
*** Pilot cartridge is
Compatible with all Eureka grip models that use 5th gen. ebonite feed.
This concludes the cartridge-related research.
thank you
