If it is only the smaller groove you are trying to eliminate. Why not fill the smaller groove with a thickened epoxy. If you have experience with epoxy, I would think a pretty thick batch of epoxy, and a Popsicles stick (or similar) the same radius as the bigger groove to clean it out. I have seen epoxy used in worse conditions that I picture a sheave being in. Just a thought, but I would sure try it before spending big bucks on a new sheave.....:-)
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