Likely causes are a nib width unsuitable for the hand position or unsuitable paper; standard problems like skipping and starting problems are documented many times. Cartier offers no slant/oblique nibs: M and F nibs are round-ground and also usable for crook-writers; B nibs are flatter and unfavourable for such writers, because the nib then runs on an edge, scratches and ink flow breaks off. A nib specialist (e.g. Stift Leo) can regrind sharp edges. On the 149, an oblique nib is recommended if needed. A universally correct nib hold does not exist; one adjusts individually to each pen; ball nibs are thereby the least critical.