When I took the hand wheel off to fix the bobbin winder, I had to loosen the motor. This morning, after I lit the fire in the Hearthstone I fiddled with the hand wheel and put it all back together and did not tighten the motor. I forgot. No noise. So then I tightened the motor and the noise returned. I fiddled with the motor and all is quiet now. The fix was to fiddle.
One thing I have learned when working on sewing machines. You just can't be afraid to fiddle.