Visconti housing question

[Delum]

I have a steel Visconti nib but can't get it to fit into either a Bock 5 or 6 housing. Does Visconti use their own housing system?

[broadoblique]

Visconti uses Bock.
The difference between 5 and 6 should be easy to see. The #6 loose nib is about 33mm long (1-1/2") The #5 is much shorter, maybe 26mm 1".

Visconti #6 feed usually has a slot on the bottom that fits a tab, or spine, on the bottom of the collar. I think the #5 feed has a flat on the bottom.
You need a matching feed.

Good luck!