Revain is about $13 overpriced. However, I've been using them as a pro for over 20 years and they perform as well as you can expect from something spinning at 540rpm for many hours. Just remember to use silver sealant on the driveshaft and strip it off from time to time adding WD-40 to thin the driveshaft as heat will thicken it. If you don't, it's not going to be fun removing that thing from the driveshaft when it eventually needs to be replaced. Also remember to lock the threads on the set screw.
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