A guide lay dead on my granite table. The other arc is about 0.2mm. The slides should have a slight preload. They have absolutely no game or play. They don't slide under their own weight, but fit snugly. There are two spots on a track that are slightly narrower. The M3 mounting holes in one of the carriages had to be chiseled (tapped) before I could screw in the screw.
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