Can refill blocks for the Montblanc notebooks from the Meisterstück Collection be bought back, and are there replacement erasers for Montblanc pencils?

For the Montblanc notebook cases from the Meisterstück Collection, replacement blocks are very well separately available; a complete purchase of the case is not necessary. The blocks are available where the case was bought too, as well as in most Montblanc sales points; the price lies in the single-digit euro range (around 3.50 euros per block). Likewise matching replacement erasers for the Montblanc pencils are available and can simply be exchanged. In the shop, these spare parts are often not openly displayed; targeted enquiry at the sales counter, however, leads to the goal.