If this been seen elswhere, I apologise.

I've noticed a lot of people are interested in DIY valve springs - and adapting a spark plug to fit air line to pressurize cylinder etc.

After reading Jaysens excellent PDF, I'm sure a lot more people will want to give it a go.

Anyway check out this link - it may save fiddling around with a spark plug.

http://www.mytoolstore.com/kd/kdengi14.html

Dunno if they're available in Oz
A compressor distributor / supplier maybe??
Are the end fittings suitable??