Hey screene - I got a standard 18mm plug socket and carefully ground its diameter down until it fit down the plug recess. The socket cost $10.

I get straight onto the outer plugs but the centre one is a bit of a fiddle. I use a short extension with a uni joint to get the angle past the backbone.

The rubber washer in the el cheapo socket doesn't grab the plug too well to lift it out, so once unscrewed I use a magnetic stick.

Use a piece of hose pushed over the plug to start them back in, makes it real easy and avoids cross threading, then nip up with the socket.

Hope this helps,

Cheers,

Roden