wrote in message
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Jobst discusses the seal question:
http://www.sheldonbrown.com/brandt/sealed-bearings.html

At the bottom of the page there's also a link to many other articles written
by Jobst Brandt and they are almost priceless.

Of course there are a few people on the group who are so jealous of Jobst's
reputation (the one for accuracy, not the one for friendly rivalry....) that
they would argue that he doesn't know what he's talking about.

But anyone that reads his stuff can appreciate it.