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yes, only the threaded section is moving exactly how you've described it. I was able to tighten the cogs by using the force of the cog on the other side pushing up against the flange, and basically just repeating it on both sides until both sides were fully on. I will note that it required a lot of force to get the cogs on towards the end. I definitely wasn't stripping and threads but it was a right bastard.
How did you know where the centre is? on mine the size of the threaded section on both sides isn't equal. I've just kind of put it back to where it roughly was before.
haveo
BigH
Just to confirm the threaded 'rod' is the only thing that is moving? The flanges with the bolts do not?
The same thing happened to me with my fluidisk, I went to remove the cog and it moved the threaded 'rod' so I dismantled the axle, stuck a conespanner in the notches and u done the cog like normal. This held the 'rod' in place. I then had to turn the 'rod' with the cone spanner to re align the kevlar wheel back to the centre ever so slightly. The cog chainline was out by a couple mm I think. I asume that what has been said about the tension is also true but as long as both sides of the 'rod' turn at the same time tension shouldn't be affected?