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Well, we've gone to the ball bearing masthead sheaves and added ball bearing turning blocks in conjunction with the mast plate. The exit blocks are shot and I haven't seen any ball bearing versions.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.