If the cap of a new Solitaire rollerball sits too loosely, that is a typical case for Montblanc service. If the purchase is less than two years ago and the warranty card is available, the worn-out inner cap is exchanged free of charge. Outside the warranty, the so-called service flat rate 1 applies, which for a high-quality writing instrument is nevertheless worthwhile. The simplest is to bring the pen for this to a Montblanc boutique.