Don,
As I was going home a few days ago, a motor manufacturer's truck went screaming by me. When I looked up, painted on the side of the truck was a motor that looked exactly like the Tetrix motor. I was trying to stay on the road so I didn't get a good look at the name but the address was in one of the northern suburbs of Chicago. Have you tried contacting Pitsco/Tetrix? If I was them, I would like to know there was second source on motors to turn to for production.
Also check out Precision Microdrives.
https://secure.precisionmicrodrives....1282002218fc0c
Al