Before you mount the y_idler_mount make sure that the y_idler_tensioner is a smooth fit in the idler_mount otherwise you will end up removing it to correct.
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Skip the last step (yellow) if you plan to reuse the original Prusa bearing clips
Before you mount the y_idler_mount make sure that the y_idler_tensioner is a smooth fit in the idler_mount otherwise you will end up removing it to correct.