Bonjour Jim,
Great job indeed !
How did you solve the premature bearing wear problem ?
JMC has made one which run over 60 000 RPM (!) and it has this problem :
(Subtitled 
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I haven't had any problem with the bearings as yet and I've spun this up (on air) for hours at ridiculous speeds.
Easy to change out the bearings if they ever eventually need to be.
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