16 Additional requirements to be met by approved handler at outdoor pyrotechnic display involving firings of class 1 category G substances to heights over 60 m Regulation 43(a) of the principal regulations is amended by revoking subparagraph (ii), and substituting the following subparagraph and words: "(ii) for its ability to withstand the ignition of an upside-down shell within the mortar tube without producing any hazardous fragments;---and in no case is the mortar tube to be of metal or PVC; and"."