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It would go in a 24 or 25 mm hole fine.

Your not going to get an 18mm nib into a 17mm hole, although you could probably make a smaller one, like a 16mm stay and look good in a slightly larger hole. The nib will "flare" our quite a bit...

It's a 22 mm x 65 mm loft Super Badger Bulb from the Golden Nib.

22 Super Badge BULB [22-SB-BULB] - $25.95 : Fountain Pen parts - NIBS, - Wholesale Fountain Pen Ink - Golden Nib AZ

It's so...

Hey guys, thought I would show off my first brush restore. It's not completely obvious anything was done here because the brush was in such good shape when I found it, but I did replace the knot...