Would like to get opinions on how these work. Am using a 2" mast with a T2X rotor., TB-3 Thrust bearing. Now about 12 sq. ft. load. Going up to about 20 sq. ft. Had to pin the rotor to the mast to keep it from turning. Their web site is www.consultpr.com Reply off line if you like. jbpmlp at comcast.net Mark W9UZ Wheaton, IL