Sheaves for wire rope have a more 'V' shaped groove then the 'U' shape for line.
I'd recommend inspecting your masthead sheave to see what is there and what condition it is in and consider replacing the sheave with one intended for line.
McMaster-Carr carries a large number of off the shelf sheaves: McMaster-Carr
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Last edited by CalebD; 04-30-2011 at 05:06 PM.