I write with a heavy hand and frequently find that vintage nibs don’t suit me. Some modern nibs the same. Like Ole Juul I have vintage pens with no flex which I enjoy very much for example the Sheaffer Triumph nib or the P51 as well as more traditional nib types.

Price is also a factor - the pens whose nibs I am looking to replace are not top tier and have steel nibs already. The gold vintage nibs I have seen sell on eBay (and I mean fairly standard sized CS nibs rather than Onoto #7s) sell for far in excess of the value of the pen itself.

Grainweevil, would you share which makes/models of pens you have switched nibs on?