def METHOD_NAME(self, old_id, new_id):
    """Redirect the input to point at a new protocol.
    The main use of this method is when merging multiple protocols
    into one.
    Parameters
    ----------
    old_id : str
        The id of the protocol to replace.
    new_id : str
        The id of the new protocol to use.
    """
    self._protocol_ids = tuple(
        new_id if x == old_id else x for x in self._protocol_ids
    )
    self._update_string_paths()