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LaserFrennox
You can run the cassette in a ‘9-of-10’ config by ditching the 11 and 13 tooth sprockets and replacing with a 12 or 13 tooth serrated locking cog, available from Sunrace.
This will give you 9 speeds on your 7-speed freehub, and work fine providing you set the limit screws on the rear derailleur appropriately.