Nib regrinds are basically also possible on Montblanc nibs. As an alternative to the US specialists Mottishaw and Binder, collectors recommend in Europe John Sorowka ('Oxonian') in England, who, after multiple experience, delivers equivalent quality; per nib the regrind costs about 45 pounds (around 53 euros including shipping); common reworkings are e.g. from B to stub or italic. On customs questions on shipping to the USA and back, only customs itself gives binding information — legal ways exist; the exact formalities, however, change and should be enquired about directly.