@TimSmedley
That's not the case if, as the OP states, the inner bush has become dislodged which it can do.
@Trevstar
I managed to get mine back in place simply by popping a medium sized screwdriver just inside the hole and manouvering the disc both upside down and turning at random until the bush slid over the shank of the screwdriver.
It's not a quick job by any means so you'll need plenty of patience
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