Join Date: Feb 2007
Location: Carrollton, Texas
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The sheaves are replaceable but the block was not designed or intended to allow the sheave to be replaced. I have replaced sheaves on identical blocks in the past (for friends on a budget) but it took a while to find just the right sheave. On top of that I had to manufacture the replacement rivets. If you have all the right tools it's no big deal but for the # of manhours you would consume it would be better (and depending on your motor skills and replacement materials) safer to purchase a replacement block.
West Marine has a good assortment of replacement sheaves in their catalog with all the dimensions and composition materials noted.
Opportunity is missed by most people because it is dressed in overalls and looks like work.