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I have the Park UT tools and Chorus steel bearings are <$40 a set. I do what the other's posted as far as periodically greasing the cups but I don't do anything to the bearing. They were put together with good grease, just let the bearing live out its life.
My toolbox has an extra set of cups for Eng and Ita. I found a cracked cup once and would have been screwed without a spare set. I also have a wavy washer and retainer clip, just in case.
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