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@freddo
I've just fited FSA carbon cranks, with ISIS BB. I'm getting a slight "slip" between fore/aft pressure, not much but enough to notice. Feels like the cog is slipping slightly, but I know it's not. I thought it was the chainring bolts, but have just checked with a buddy and its not that either. Everything's been fitted properly.
Then I thought that maybe the crank is slipping against the splines of the BB until I found this thread. Is this the FSA spider / arm separation problem? I can't find much on t'internet - but don't see how they can slip and not come clean off. Any suggestions as to what else I could check? it's really annoying.