Shift to any larger gear to get the chain out of the way and look down on the series of smaller sprockets. Is the space between the last and 2nd the same as on all the others? It should be.
If not, either you're missing a spacer, have the wrong spacer, or you have the outer sprocket on mirrored with the built-in spacer to the outside. if the latter, reverse the sprocket and you'll be set.
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Chain-L site
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