I am at a loss on where you're trying to go with this...
I am at a loss on where you're trying to go with this...
I got the general intent of the thread, and where it's been. I'm confused on where you're going with:Is there a point to that? Neither Visconti, Kaweco nor Delta use the same feed and nib across every model, and often there are changes over the production years.The feed on the Unica is completely different to the feed on the standard Bock unit that Visconti and Kaweco employ.
The feed and housing on the Bock units for Kaweco and Visconti are identical. I can unscrew the Kaweco unit and put it in a Rembrandt, and vice versa. The Kaweco nib is obviously smaller than the Visconti though.
I don't have one to hand to compare, but in pictures it looks as though Edison uses the same Bock unit as Kaweco and Visconti. I expect many other companies do too.
The Delta Unica feed is completely different to the Bock one for Kaweco and Visconti, and doesn't use a screw in nib unit.
Bock produce an "off the shelf" nib unit for many companies, with custom options available on nib size and engraving, and markings on the bottom of the feed.
Visconti, Kaweco, Edison (maybe), previously TWSBI (now using JoWo apparently) amongst many others, essentialy use the same nib and feed.
My Edison #5 nibs fit my TWSBI 580 without any adjustments and vica versa, so it does look like the standard screw in nib and feed units are fully interchangable.
here men from the pennet earth
first set nib on the moon
we came in peace for all penknid
"Identical" or "interchangeable"?
5ea #5 Bock nibs. From left to right: Kaweco Sport Classic, Kaweco Art Sport, Kaweco Sport 883 (made by Visconti), Faber Castell Ambition, Conway Stewart 58.
They're certainly not identical. In some cases they are interchangeable. Generally you can put any #5 nib on any #5 feed (with some exceptions). Bock uses the same thread pitch across their #5 housings, so yes in most cases they are interchangeable. You could also theoretically pull the nib from your Kaweco or Visconti and fit them in the Unica using its feed, or use the nib and feed from either of the two and friction fit them to the Delta.
All 5 of those pens write great. Perhaps the problem with your non-writing Bock nibs has nothing to do with Bock, Kaweco or Visconti...
The Unica (and Serena) using a JoWo would explain a lot.
I've seen pictures of other steel nibbed Delta pens (Capri, Italiana, Virtuosa) and they don't half look as though they use the Bock unit that's used in the Rembrandt.
In this video at the 11min mark he compares the Rembrandt and Capri
https://www.youtube.com/watch?v=BR-IQMExtO4
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