Yes, a spacer just to compress a little bit the spring, to avoid the whobble. Springs are fully uncompressed when the wheel is in the air and this is not a good thing.
But there is a good news. If I turn the spring fully clockwise, the whobble is reduced.
Another thing: I think to have found that my Materia is lower on the left side. Just a few millimeters, so I think to swap left and right springs. I will take this opportunity also to double check the plates and fixing bolts/nuts.
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