I've had to re-sac a few Sheaffer Slim Converters and I have found a straightforward technique. As more and more of these converters are drying out as the years go by I thought it would be useful to record my method of doing it.
- I'd advise trying to push out the part that goes into the pen from the whole at the end (closest to the press window). Using a 3mm rod or a long screw driver with its end cut off. I would suggest using heat from a heat gun to warm the end so it comes out easily. This has far less risk of damaging the front end of the converter (then using e.g. a hook).
- Once you have removed the old sac I would advise using a silicone sac (size 14 or 15) instead of a rubber sac as the wall thickness is smaller. One of the issues I had in the past was that the metal shell cracked due to the pressure the sac was causing against the wall. The sac fitting tightly is less of an issue as the metal shell will ensure it is fitted tightly.
- Whilst there shouldn't be much of an issue a thin coating of shellac is useful on the joint between the converters metal shell and the internal parts of the converter as it will stop the internals being exposed when the converter is removed from the pen.
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