Are frequent defects on cap thread, nib and body of a Montblanc StarWalker fountain pen typical, and how does Montblanc react with repairs outside the warranty?

On the StarWalker, the cap thread is inside of plastic, while the barrel thread consists of metal; with too firm tightening, the plastic thread can give way over time. Repeated defects of the same components are, however, not the rule. The warranty does not automatically extend through a repair; after expiry, the customer bears the costs, which for a cap can be around 120 euros. Goodwill is a matter of negotiation and to be weighed entrepreneurially between prior pricing-in of possible repairs and individual assumption of costs.