batons for the repair of the caves

[Zealot2002]

Помогите с переводом такого выражения: "batons for the repair of the caves..."

Контекст таков: "...The main causes of defect and unreliability of the alternator (with consequent unavailability) are identified in the stator package: break-up of connecting rods (original design defect), presence of artificial prosthesis in the teeth of the ferromagnetic nucleus, small irreparable damages on the surface of the gap width, as a consequence of repeated extractions of the rotor and the BATONS for the repair of the caves."

Спасибо!