Nib sizes for 51s

[Jon Szanto]

Are the nibs on a Parker 51 interchangeable between a Standard and a Demi size pen, or are there differences (in size) to the nibs? Not the tip, but the entire nib.

[pajaro]

All are the same. Got this info from Farmboy.

[Chrissy]

Yes 51 nibs are all the same size. In fact, you can adapt 61 nibs to fit 51 pens too. You have to flatten the little gold flap.