Today, we put up the mast for another sailing season. After doing an inspection of everything on the mast, all looked good but the two plates at the top of the mast that enclose the main halyard sheave.

It appears the halyard has been wearing into the plates. I still have a wire rope halyard for the main.

My question is, what would cause the wear on the plates? It almost looks like the halyard has been a rope saw on this.

Also, is it common to keep the wire halyard or have people converted over to rope? If so what is required, does the sheave in the mast have to be replaced.

Thanks!