Lefty loosey. Should be around 70Nm on it from memory. Easiest way is to give it a couple ugga duggas with with impact (electric or air).
Otherwise there are basket holding tools you can use but as you've stated the basket is quite soft. You could also try applying some downward pressure onto the plates themselves. That may add enough friction to hold everything in place while you (or someone else) cracks the nut undone.
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