After investigation it seems you have to separate the AFM body, it splits and there's lots of nuts & bolts holding it together. Unfortunately they're quite tight and my allen keys won't do the allen bolts, so I'll give up on that too.

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg