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BigH
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.