Can detect lack of play in bearings. After a bad experience with the normal green/red bearings, they turned out to be very good and at least match my other ones in terms of color. - Lubricated before use, I found them impeccable and absolutely no rubbing on the rail. Mine have clearly been pre-cleaned and reassembled, which is not the case for many. I can only speak from personal experience but they were lubricated with clear oil and ready to go, not clogged with grease to be removed and not soggy. I hate this. There doesn't seem to be any dirt from milling fragments in the pocket at all. There are no complaints at all.
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