After our chat on the phone I thought I'd let everyone know how I've done mine: With my CK on my Megamo I have 2 old ground down snail cams on the disc side, and I'm then running my normal snail cams on the outside. I've got a +40 adaptor on my disc mount, and then my caliper is spaced so its about 1.5-2mm back over. In theory if I filed down my snail cams a bit more I could eliminate about 1mm of spacers, and it would be a bit neater, but it's all good. So yeah, CK hub, 2 3mm spacers inside the dropouts, and spacers on the disc mount and you should be fine. Snail cams on the outside allow you to adjust your chain normally.