Hi Ricardo,
Thanks for your kind offer, but being obsessed to find out how the system is designed I prefer to do it myself .
And i have good news, i finally succeeded in getting the filler completely disassembled & repaired.
My initial thought the piston should be unscrewed from the filling knob using a screw driver through the barrel from the section side proved too be right.
Note however one should first unscrew the filling knob from the barrel before one can do so.The screw driver slot in the top of the piston rod was rather un-deep, and consequently the screw driver easily slipped out of the slot.
But finally the piston rod unscrewed and after removing the piston housing enclosure screw I had to system completely disassembled
First thing I did was making the screw driver slot in the top of the piston rod deeper.
The soft rubber piston cup seal axially slipped over its - too small - back top collar resulting in damage on the sealing lip , hence leakage.
I’ve replaced the cup seal with a 5 x 1,5mm O ring and provided a larger back up ring at the back and at the front of the O Ring.
Filling is perfect ,and surprisingly the pen can hold 2,7ml of ink !
On the attached sketch and picture you can see how the system was designed an how I’ve repaired it
Note the small O-Ring Ancora provided on the piston rod just behind the front threads on the sketch (not yet installed on the picture, sorry ).
This was done to ensure the threads can not be overtightened and will always unscrew easily,
It surely took me 8 hours in total to find out how the system was designed and how I should get it open and repaired.
Next tom ask a friend MD to make an X ray scan, this would surely helped a lot !
I’m happy now, my frustrations are gone !
Kind regards,
Francis
BTW, I'm somewhat surprised there is not a single post on Ancora pens on your excellent site, how come ?
