Abstract: A method and apparatus for the manufacture of collar inserts made of a base insert and a seal insert, by which the base insert and the seal insert are introduced in the sealing press lying aligned on each other. The base insert and the seal insert are provided with at least two truing openings, respectively, corresponding in arrangement to truing mandrels on a support, the latter being insertable in a sealing press with the base insert and the seal insert disposed on each other aligned with the truing mandrels inserted in the respective truing openings of the inserts.