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However a few movements back and forth of the cage and it goes all tight again. So I back off the bolt and it’s nice and springy again. But again a few movements back and forth of the cage and it goes all tight.
It’s definitely being caused by the clutch
The solution here may well also be Loctite - disassembly would've significantly reduced the effectiveness of any factory compound. Assuming of course there isn't a proper locknut or something you've missed. You can tell I know fuck-all about derailer clutches
It’s definitely being caused by the clutch because when I remove the clutch mechanism it’s not happening and remains nice and springy no matter how many times I move it back and forth