Well, I know a lot more about the insides of my heavy duty quilting machine!
The good news was that while it is interesting...we still needed to find the problem.
I hit a pin that was mistakenly in the quilting path and the machine ground to a halt!
This machine is 25 yrs old...it didn't like the interruption.
Not for the first time, I am very grateful for my husband who figures out all things mechanical!
Now that he has figured out the problem, he even knew how to fix it!