O.K folks, I have real data on Alt bearings.  Using a G.M. alt, rewound
and a Neo core.  5 foot blades.  Have taken great care to use the very
same bearing through 6 tries.  Different windings etc.  26 months, almost
to the day, it started to growl a bit.  It will come down tomorrow.  My point being, I guess, that a 6203 bearing (C-3) is meant to turn at about
30,000 r.p.m. Under a radial load. They are greased at the factory (not much) because the
high r.p.m. causes heat and increases lubrication.  In -40 conditions
there isn't much heat.  You need to alter the lubrication to what your
purpose is.  I injected about 2 CC of 20-50 Synthetic into the bearing
at the onset.  2 years is a good life I think.  This might be just good
luck, but I will keep up the actions exactly, and see what happens.
    For those who will want to know, SKF 6203 2rns.  Also, for those
who would ask, the back roller bearing is fine.  Same treatment. My guess
is that the front bearing takes up most of the load.  Not like a belt
condition.