Taking Care of Your Pens from Now!
Pen care for an old pen isn’t much different from that for new. Periodically flush it out, filling it with cool water and emptying it a few times. Doing this once every few months will keep dried ink from building up and interfering with ink flow. Do not use hot water or solvents. Use only inks intended for fountain pens.
Carry your pen nib upwards and you should have no trouble with leakage. Keep your pen full of ink, since ink flow can become irregular if the ink chamber is close to empty. 95% of “leaky” pens can be cured by the above two precautions!
Do not soak any part of your pen other than the nib assembly! Pens are designed to hold liquids, not to be immersed in them. If ink gets into the inside of the cap, wipe it out with a damp cotton swab. Dunking the entire cap (or the entire barrel) into water is unnecessary and may harm your pen. If your pen is clogged with dried ink, soak it by placing it nib-down in only enough water to cover the nib and the lower part of the section, leaving the barrel dry.
When placing the cap on the end of the barrel, set it in place gently, like putting on a hat.
Avoid operating the filler mechanism (lever, button, or whatever) when the pen is fully closed, as this puts excessive strain on the sac and the filling mechanism: when the cap is screwed down, the inner cap seals around the nib, leaving no place for the air in the ink reservoir to escape. Likewise, be gentle when pulling out the knob on a plunger-filler (the downward stroke, however, should be vigorous).
Be aware that bright sunlight can cause hard rubber to fade. Protect your pens from excessive heat, such as in a parked car on a sunny day. An outside pocket is cooler than an inside pocket and is better for both pen preservation and slowing of ink evaporation.
Thanks for reading!