HARKEN 29mm Self-Contained Sheaves, 161 Complementary Hardware_Replacement Bearings while springs allow the block

while springs allow the block to articulate under load to keep the sheave properly aligned

and beckets

Harken 40mm Carbo Air® Stand-up Block with spring to construct a 2:1 or 3:1 purchase

This 22mm Single Micro Block has countless applications and is found on thousands of boats

Series 70 BB Ball Bearing &amp

HARKEN 29mm Self-Contained Sheaves, 161 Complementary Hardware_Replacement Bearings while springs allow the blockSelf contained sheaves are designed for sailors to use in custom applications. The Micro, Bullet, and Big Bullet sheaves are Delrin with Delrin ball bearings. They are scored for rope. 16 mm sheaves are Delrin and feature stainless ball bearings that ride in a grooved race. Midrange sheaves come in either Delrin or aluminum for wire. Wire sheaves are Hard Lube anodized aluminum that rides on high load composite bearings. Ball bearings in the 38 mm (1