QUOTE(Brian Anderson @ Nov 18 2007, 04:52 PM) [snapback]422609[/snapback]
Well, the problem could stem from multiple sources. First off, I will say I've seen caps with enough dried ink to constitute seemingly days if not weeks of writing. Dried ink leaking into the cap over 30-40 years can easily build up under the inner cap and be a real pain to clean out. Short soaks and q-tips aren't likely to clean it out sufficiently. You may need to soak the cap for an extended period of time (a day or two) in a partial ammonia solution. I don't generally recommend immersing caps, but on esterbrook J pens they seem to be resilient to prolonged soaking. I have done it many times without incident. After soaking it is very important to let the cap dry thoroughly. If you have an air compressor, that might speed things up, otherwise roll up a tissue and shove it inside the cap to absorb some water. Then let it dry for several days. Try to get as much out as possible by shaking, hair dryer, etc. first, which will speed things up a bit. Again, there's no substitute for prolonged drying time here. If you had an inner cap puller, it would be much, much easier, but not everyone has one.
If the cap is indeed clean, then the problem could lie with the sac length or size. If the sac is too large (should only be a 16 on a J pen), or too long (they should be cut almost deceptively short) it will give you problems. If you didn't put it in yourself, you might want to check. If the sac is bunching up in the end of the barrel, it will leak. If there is a pinhole in the sac, it will also leak.
Also, this time of year with changing temperatures, it is easy for ink to expand/contract when switching from a warm house to a cold car, etc. I always let my pens acclimate to my office for a few minutes before using them. This may not be your issue either.
Also, check to make sure the nib is screwed in tightly. Doesn't sound like you have that problem, but never hurts to check.
Best-
Brian
Thanks Brian! I will try soaking the cap first. I have a feeling that dried ink is the culprit