My MB149 Traveller REALLY doesn't like cartridges. It writes beautifully if the nib is dipped in ink but use it like it's supposed to be used and it's awful. Poor feed,no ink coming through just dreadful. I've flushed it through countless times,cleaned it with a peroxide solution only used MB ink cartridges and still it just won't work properly. It was s/h so MB aren't interested. Bloody awful for a pen that costs so much. Any ideas/help appreciated.