QUOTE (ANM)
I am guessing that your feed needs cleaning. It looks like it might be restricting the ink flow due to some dried crud rather than the nib needing adjustment.
I soaked it for a few hours in a 10% ammonia solution, then ran it through the ultrasonic cleaner for a good half-dozen three-minute cycles. It seems crud-free, but I'll take another look.
QUOTE
If the nib needs adjustment for more flow, you need to lift the tines slightly above the feed, not just floss them so the gap is greater. Finally a scratchy nib suggests that the tines are not perfectly aligned. A magnifying glass will help you see the end points and adjust for alignment.
Thanks, I wasn't aware I needed to lift the tines. I thought the nib flossing kit was all I needed. I do believe it needs a bit of flossing, though, because the tines meet at the tip, no light passes between them at all. I've ordered a good loupe, and I'll have a go at re-aligning the scratchy, too-wide one once it arrives.
QUOTE
As a last resort, you can just swap out the old nib assembly for a different one.
I've already done that.

I really like both of these pens, and they're my first two restored Esterbrooks, so I wanted the better type of nib. I've ordered a pair of the Master series nibs from Richard Binder. The prices were quite reasonable, but still more than I paid for either pen.

I'm going to try to get the existing nibs working, in case I need replacement nibs for the other Esties I'm trying to knock into shape and re-sell.