A holding unit and a vibration transmission system are disclosed. The holding unit comprising a holding plate is configured to be attached to the skin by means of magnetic attraction between a number of external magnets that are either: a) integrated within the holding plate; b) mechanically attached to the holding plate; or c) constituting the holding plate and a number of internal magnets implanted under the skin of a hearing impaired person. The holding unit comprises a transmission member or plate member configured to transfer mechanical vibrations from a vibrator through the skin to the bone of the person. The transmission member or plate member is interconnected by a mechanical flexible coupling to the magnet(s) of the holding plate.