Peter, Monroe
Thanks guys.
Your exactly right about minaturising engines, as with alot of things, always gets more challengining as they get smaller.
But yeah I used "Holley" Nos solenoids, perfect size and rating for this kind of application and many more, as much as I'd like to say I robbed them from my Nos kitted out car, they were actually robbed from my Nos GSE gear that I use for one of my high power rockets. Been trying to hunt down more 2nd hand ones but exact ones like this I guess people hang onto!
I'll look into those Monroe, cheers.
Iain