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Hello, I'm a beginner, but I have had some success. Using an MK3 running Slic3rPE. I found a cheap set of feeler gauges work well to free up the leaves by sliding the gauge between the leaves and the inner and outer shells.
These may help:
So there is one upper pin on the inner shell that seats in a hole in the upper right corner of each leaf, about which the leaves rotate; and the other pin for each leaf is located on the outer shell about half way down and sits in a groove in the leaf, and it controls the leaf's travel. See the upper pin and hole, and the groove for the outer pin in the pic above.
Here is recent video showing my progress .https://www.youtube.com/watch?v=5LfGx223YGU&t=21s
I hope this helps, and I would be happy to help if anyone has any questions - EASY ones because a real NEWB here.
Lastly, to anyone who hasn't yet had the experience, just keep at it - the joy one feels at the moment the leaves break free for the first time makes it worth the effort.
Luck to all.