I have just recently repaired a pen of this type, it was not easy, basically gripping the overlay to squeeze the barrel end and then dismantle to repair. I installed viton "O" rings and tested the pen with out the overlay, before fully assembling with the overlay. A very bad design and not an easy task to carry out on pens that are normally fairly straight forward to repair.
Eric
eckiethump
Member Since 28 Dec 2011Offline Last Active Private