Notwithstanding any provisions of the general laws to the contrary, (1) for the purposes of determining pension responsibilities a special justice appointed, or first appointed, as the case may be, to his office prior to January second, nineteen hundred and seventy-five who serves full-time in accordance with the provisions of this section shall not be subject to the provisions of section sixty-five D of chapter thirty-two; and (2) for purposes of determining the pension rights of a special justice who serves full-time in accordance with the provisions of this section any special justice may elect to waive the provisions of section sixty-five B of chapter thirty-two and his full-time service shall be deemed the service of a justice of a district court, other than the chief justice, and said special justice shall be entitled to the same credit for his part-time service, if any, as a special justice as is provided in section sixty-five A of chapter thirty-two for a justice of a district court who has previously served as a special justice; provided, however, that nothing herein shall be construed to alter the pension rights and responsibilities applicable to a special justice who does not file a certificate under the provisions of this section.
Mass. Gen. Laws ch. 218, § 6A