Here's an exploded diagram http://www.users.globalnet.co.uk/~hadland/sa/safg.pdf
I think it's GL603 and 343 that must not be separated, but I'd leave the whole dynamo assembly alone.
Also check out http://www.sheldonbrown.com/sturmey-archer/ag.html and http://www.sheldonbrown.com/sturmey-archer/fw.html and here http://www.hadland.me.uk/samaintind.htm
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Here's an exploded diagram
http://www.users.globalnet.co.uk/~hadland/sa/safg.pdf
I think it's GL603 and 343 that must not be separated, but I'd leave the whole dynamo assembly alone.
Also check out
http://www.sheldonbrown.com/sturmey-archer/ag.html
and http://www.sheldonbrown.com/sturmey-archer/fw.html
and here
http://www.hadland.me.uk/samaintind.htm