D'oh! Yes. Typo on my part. The U-frame followers are rigid and don't provide tilt. But the Norma is not yaw-free--the tilt axis is still above the swing axis. The F and P put the tilt axis below the swing axis, making it yaw-free. Not that being yaw-free is all that important to most people.
Rick "fingers ahead of brain" Denney
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