I'm trying to install a 10 speed, short cage, X9 mech on my 2012 Demo 8 and can't get the top jockey wheel to align with the largest cog on the cassette, as per SRAM instructions. Despite adjusting the mech screw the top jockey wheel stops 1-2mm short of being directly under the large cog. The cassette is a 10 speed 11-26t SRAM cassette. The hub is a Chris King ISO. Attached are a couple of photos showing the problem, in the first I placed a piece of white card behind the cassette (looking forward from behind the bike) to try to make the alignment mismatch more clear. The cage is as far over to the inside as possible.
I noticed there is about 3-4mm of axle visible between the small cog and the inside of the chainstay (2nd photo). Should that be there? Is the cassette too far towards the center of the wheel or is the mech cage not moving as far inwards as it should? Do I need some kind of spacer behind the cassette? Thanks for any help you can offer.
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