Sharki genoa top furling device blocked


My top furling device for the genoa is turning very very badly. I need help to get it going or to dismantle it.
I have already taken away the brown tigthening ring and now I can see a white plastic bearing that seems to cause the problem. 
Any idea how to get it going again?

Thank you,
Mickmoon, Sharki, hull no. 176

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