The deputy registrars and judges of registration provided for by Section 6-30 of this Article shall be selected by the Board of Election Commissioners in the manner and for the same term provided for judges of election by Sections 14-2 and 14-3 and shall be officers of the court and have the qualifications prescribed for judges of election by Section 14-1; provided that in each precinct in counties of 500,000 inhabitants or more, one deputy registrar may be appointed from outside such precinct if not enough other qualified persons who reside within the precinct can be found to serve as deputy registrar in such precinct. The one deputy registrar so appointed to serve in any precinct in which he is not entitled to vote prior to the election must be entitled to vote elsewhere within the ward or township which includes within its boundaries the precinct in which such deputy registrar is appointed and such deputy registrar must be otherwise qualified. A report of such selection shall be made and filed in the court and thereafter all provisions of Article 14, Section 14-5, of this Act with respect to judges of election shall apply to such deputy registrars and judges of registration. Such registrars and judges shall be notified of their appointments in the manner provided for judges by Section 14-7 of Article 14 of this Act.
     Any vacancy in the offices of deputy registrar or of judge of registration on the day of registration shall be filled by the registrar or judge of registration present, always selecting a person of the same political party as the absent deputy registrar or judge of registration; and the same oath shall be administered by the registrar or judge of registration present to such deputy registrar or judge of registration as is provided for regular deputy registrars and judges of registration. All oaths of office or affidavits which have been signed and sworn to shall be returned to the office of the Board of Election Commissioners in an envelope provided for that purpose, which envelope shall be sealed.