I got a free Muft eyedropper with a recent order from Fountain Pen Revolution, and I like it a lot. I filled it with Iroshizuku Momiji, and for a week, had no real problems -- the FPR pens come with a coating of silicone grease on the body threads, so I was able to just take it out of the shipping package, ink it, and go. It's a very wet writer, which is nice, but after about a week, it began to leak out of the nib. A sudden blob on the page, and when I looked at the nib, it looked like there was a *lot* of ink welled up between the feed and nib. After awhile, the occasional blobs became pretty constant.
it is my understanding that, when eyedroppers get low, many of them become prone to spitting ink in this manner. But when mine started, it wasn't *exceptionally* low. Perhaps a touch under half-full, I think.
My question: if I want to address this, where should I start? Is this likely to simply be the way a smallish eyedropper works, or are there nib/feed aspects I can investigate to make it less likely?
Sorry if all this is uselessly vague, and many thanks for any suggestions.