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As many have said before the Z leadscrews need to move freely and mounting the anti wobble did more harm then good to my prints.So: don't use them!
I've had no significant better prints after applying this mod; maybe even worse. Several sources state that it isn't a good idea to hold the leadscrew tight, and I tend to agree: rigidness of the Z axle itself seems to be the relevant factor.
Ty for posting a picture of your z-antiwobble.
I hope you (pretty sure though) get better print quality of it.