- Height adjustment via upper-section length change (this does not change linkage geometry like moving-ball designs). - Flex and rotation-free lever construction with full-length vibration-absorbing bushing. - Linkage geometry perfectly corrected, with self-adjusting primary pivot bearing that permanently retains lubrication and precision (most models). - Zero-tolerance lower pivot bearings that never require lubrication and eliminate significant mechanism friction. These do not wear or ovalize like solid-metal or plastic designs with expanding tolerances.
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