We've been experimenting with substitutes for traditional seal materials for some time. In many cases, cork seals can be replaced with O-rings -- though finding the correct and almost always special-order sizes can take some doing.
After considerable trial-and-error, we've found what we believe to be the perfect seals for Waterman safety repair. The pen itself requires no modification, and the seals can be installed with minimal effort (cork seals in this case have to be cut very thin, with a high discard rate in both cutting and installation). The seals are listed here (scroll down), with a link to illustrated installation instructions.
Coming up very shortly are sets of seals for Conklin Nozacs. The Nozac is not like most piston-fillers, in that the Nozac piston does not come apart to allow a new washer-type seal to be slid into place. Replacement seals either have to be stretched over the piston head, or -- if made of cork -- sliced and glued around it. We will shortly be listing kits of O-rings that can be installed in pairs to provide a better-than-original seal with minimal effort and cost. Since Nozacs come in different sizes and with some variation in internal dimensions, our kits include four sizes of O-rings that should fit all Nozacs from 5000 to 7000-word size.
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