I've ordered the eject spring kit for the standard cheapo dzus style fasteners from garage56. If my experience with a Piper Arrow engine cowl is anything to go by it should make removal/refitting a doddle.

Hi Richard,
Having fitted my G56 spring , I have had to go back round the fasteners replacing the the factory issue circular wire clip that stops the zues coming right through the bonnet with a proper 6mm E type circlip. The spring are not strong but had enough force to pull one of my zeus clip clean through the bonnet. Not the springs fault , the factory fitted wire was failing fast with use. The E clips I have fitted in place of the wire stop that completely. So I suggest considering doing this at the time of fitting the springs to save undoing them all again !