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@retrodicorsa
You can't fit a 9spd cassette to an 8spd rear hub/freehub, BUT if your 8spd cassette is loose sprockets with spacers (most were) then you can replace the spacers with those from a 9spd cassette and then it will index perfectly. The 9spd cassette will have one more spacer than 8spd, this one you put on the freehub first before the large sprocket. I have a set of 9spd spacers you can have for beer(s)! Obviously the key thing is to get the hi/lo limit screw set correctly, and the cable tension, then you effectively 'lose' the 9th click on the Ergo. I'm happy to help set this up for you if you like (you know where I live!) = more beer :)
p.s. give it a clean first ;-)