*** 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).
*all currently produced pens have an additional O-ring installed onto the tail of the ebonite feeder.
O-ring is not absolutely necessary, but if you want secondary protection, O-ring can be purchased @ "Shop(Parts)" category.
the O-ring can be added to all products that use the 5th gen. ebonite feeder.
If your pen is installed with an O-ring, then there is no point of using silicone grease, unless you need tertiary(3rd) protection.
