Nib exchanges on Meisterstücks are, by collector experience, generally unproblematic and cost only the repair or service flat fee (about 49 euros at the time of the report); shipping and the exchange of the existing nib for another regular nib width are handled via authorised specialist dealers or the boutiques. Difficulties arise, in experience, when the nearest dealer is not a full-service concessionaire and merely enquires further with Vienna or Hamburg, or when a piece offered on eBay as unused is rated by Montblanc as not original-packaged. Response times from Montblanc to direct enquiries can, according to forum reports, be ten days and longer; a second written exchange or addressing the head office Hamburg or the boutique in Jena directly usually accelerates the process.
Related pages on fountainpen.de:
• Montblanc Meisterstück 146 (Le Grand): https://www.fountainpen.de/c-montblanc-meisterstueck-146-en.htm