So I decided to breathe some life I to my old TWSBI Diamond fountain pen by replacing the stock nib and feed with a 115 year old extra fine flex nib from a Waterman's 52 and an ebonite feed. It is quite glorious.

The t won't beat my new spencerian custom pilot 912, but at least now I have a reason to ink up this pen and play. The old nib was fine for a stiff extra fine nib it's just I have little use for such nibs. Plus I have a weakness for these clear demonstrators