I finished the break in last night with no problems. Everything seems to work perfectly. There was no problem getting to 2200 RPM and staying there. By the time I had finished running it in reverse at 1000 RPM for 10 minutes the motor housing was just getting warm to the touch. That's after nearly 45 minutes of continuous operation. I am very pleased.
Cleaning all the grit from the lead screws is annoying. It seems to me they don't even try to remove cuttings. Wouldn't that be a quick and simple thing to do? On the other hand, there is plenty of cosmoline. Now we know why China is using so much petroleum.
Thanks to all for your comments and best wishes. Nice group of folks here.