(1) An undertaking filed under rule 41.13 shall consist of an undertaking by the solicitor for the applicant or, where there is no solicitor, by the applicant, to pay to a Registrar an amount equal to the expenses incurred in consequence of the letter of request.
(2) A Registrar may require the applicant or his solicitor to give security to the Registrar's satisfaction for the expenses referred to in subrule (1).