When you understand, the trick is not mysterious. Harken Black Magic®
Air blocks draw your eye to those very high-load cylinder
bearings caged to reduce friction from bearing-to-bearing contact. While quietly hiding thrust bearing balls deep inside the sheave walls. The resulting strength/efficiency has landed them aboard the world’s best race and performance cruising boats for years.
Now, Black Magic is available in a smaller 45 mm size to help you sheet in and poof…disappear over the horizon.
WATCH A REFRESHER ON MAINTAINING BLACK MAGIC BLOCKS