Eureka V8.3 Symmetry (October, 2019) Upgrade List (Compared to Previous Version) 1) design changes to grip frontal section 2) grip length reduced 3) external design changes to make it more ergonomic
Eureka V8.2 Symmetry (September, 2019) Upgrade List (compared to previous version) 1) double start thread used 2) overall thickness reduced 3) grip a bit longer 4) internal design changes to improve concentricity and stability 5) fully usable as eyedropper (ink will not seep through threads, because sealing happens before it) 6) Internal design changes for smoother capping.
Eureka V8.2 Asymmetry (august, 2019) Upgrade list (compared to previous version) 1) External design changes for better postability of cap 2) Internal design changes for better postability of cap 3) Internal design changes for smoother capping
Eureka V8.1 Asymmetry + 14K nib (August, 2019) Upgrade list (compared to previous version) 1) Thread changed to 3 start thread for grip and cap. 2) external design changes 3) cap internal design changes
Eureka V8.0 Asymmetry (May, 2019) Due to, increased request for Asymmetrical deign that is cap postable, this design was created. Over all size is bigger than 149 (the nib is smaller, but bigger than #6) grip section is thicker than symmetry counterpart. Reduced grip ~ barrel transition bump smaller thread pitch used balanced feel without cap, just like symmetry. when posted, weight balance a bit to the rear uses Eureka ebonite ..
Eureka V8.0 symmetry (May, 2019) Upgrade list (compared to previous version) 1)Barrel length increased 2)cap length increased 3)grip length increased 4)grip frontal section design change 5)grip sealing design changed 6)uses Eureka ebonite feed 3rd Gen. 7)external design changes 8)uses Eureka In-House Argentium nib
Eureka V7.7 Symmetry (November, 2018) Upgrade list (compared to previous version) 1) Grip frontal section design change 2) rear gas regulator type sealing design 3) rear tail section added to grip to improve concentricity 4) grip shortened a bit
Eureka V7.6 Symmetry (September, 2018) Some of the buyers wanted a less sharper version of V7.5 V7.6 was a sausage type design, whereas V7.5 was sharp cigar type. V7.6 looked even looks a bit cute and very minimalistic. grip length was reduced a bit as well as nib length. also, started making pen pillows.
Eureka V7.5 Symmetry (July, 2018) The V7.5 is similar to V7.0. the feed was changed to plastic one, for productivity and stability. eureka ebonite feed 1st. Gen. feed was not bad at all. however, it couldn't achieve same stability as the plastic ones. This is a common problem with ebonite feeds. It is simply near damn impossible to pracically make a feed that functions like plastic feed. there's so many features that needs to be..
Eureka V7.0 Symmetry (May, 2018) Here it is, the V7.0 symmetry. here, the barrel design got its cue from the extreme V4.0, toned down a little bit. It also kept the long grip design from V6.0, with a longer linear section at the front part of the grip. It felt quite good in hand. confortable and nimble. for the nib, a stainless taiwanese import nib was used. for the feed, eureka ebonite feed 1st Gen. was used. this is when i st..
Eureka V6.0 Symmetry (April, 2018) V6 is a more ergonomic design than V5 grip length was yet again increased, as well as barrel length.
Eureka V5.0 Symmetry (April, 2018) After the Extreme design of V4.0, a toned down version was created. V5.0 also implemented a small roll stop. The roll stop material was natural stone material called calcedony. It did work quite well. however, it rather looked odd. also, i couldn't guarantee the stone will stay there for decades of use. it was later removed, as i feared it would fall out on its own eventually, even if a strong a..