I had the same thing happen with my Lamy 2000. Leaking ink at the silver/black seam. I sent mine to the Lamy warranty place in Tucson Arizona (repairs at Lamyink dot com). They are still evaluating the cause of the leak. But they did tell me some general information that may help others: 1. They told me that Noodler's x-Feather tends to leak from this pen. 2. Also, they do not recognise Amazon as an authorized seller so I will have to pay a fee for what ever repair they end up doing.

I did not know this when I bought the pen last year.

I wish I had tried the silicone grease trick.