Thank you all for the replies to the my cartridge starter question ,the reason I asked was when I saw some Chipmunks for disposal at some airshow a few years ago the one with the engine cowl open had electric starting and remember remarking to my son how the fun and anxiety had gone and blamed it on "Elf and Safety" but now in my dotage I realize that it IS more convenient.
Any tales of "Hand swinging " the little darlings all mine seem to have been in the wet weather and end in failure with elderly [to me]very senior officers glaring at me the "young erk", wet,fed up, hoping "Chiefy" would find some cartridges in the stores.