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Z1 with bushings: Able to move in three dimensions and least likely to bind. But they're Z1, so quality is suspect. Nagisa: Locked in parallel, the pillow/heim/rose bearings can only move in one dimension, and will eventually fail. Powertrix, Z1 with bearings, et al: Can only move in one dimension, and rotational forces will eventually either destroy the bearing or break down the adjuster. UAS: Able to rotate, allowing motion in two dimensions. Best chance of long term survival among current bearing designs.
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