TWSBI Diamond 580 Replacement Nib
Arrived quickly and in good condition.
Removing the F nib and replacing it with the EF nib was straightforward. Suggest one do it when the ink resevoir is almost depleted so you can refill through the new nib so it writes immediately.
The EF nib is just a bit finer than the F not a huge difference and the pen is still a very fluid writer (wet) just a bit finer line. Suits the average journal paper I write on better.
Ink: Jherbin Eclat de Saphir