I own the Leonardo version of the 14k FC flex nib with the cutouts and it's not in the same ball park as the FPNibs flex nib. Not even close.
The FC 14k Jowo nib with the cutouts is a branded "elastic" nib that Leonardo, Montegrappa, Edison and a few others sell. It's sold by Jowo and it's a soft/bouncy nib at best by comparison.
The Linda and FPNibs starts with a standard 14k Jowo nib and then underground the nib and thin the tines. The first of these was done by Binder. I have that nib and they are all like my Binder flex nib.
One thing to note as I've tried using the 14k flex nibs on my PenBBS pens
The nib clearance should be watched but it should be okay on the 456. The feed is as important as the work. The feeds on these allow the flex to keep up with the nib. Swapping the feed for the very good but not as flex friendly PenBBS feed may affect your performance. If this wasn't your plan, disregard my note but if that's what you want. You may wanna try a Flexible Nib Factory Jowo to Penbbs nib unit. It may perform better and keep the modified nib's geometry better
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