Done! It was not fearsome, just took a while. About $800 worth of parts,
including a new motor shaft.

It's so quiet now, at 1500rpm, I can hold a normal conversation 4' from the
spindle without raising my voice at all. I can take a phone call while
standing at the machine. It's freakin' amazing!

I will document; for those with rigid-ram machines, this is something I
can't find good docs for anywhere, sans totally removing the head, which I
did not do.

Lloyd