Another "duh" moment
I have been machine sewing after a long absence and thought the machine sounded rough. So I oiled it all over, still sounded rough when sewing - almost a slapping or tapping noise. Finally figured out, the plate that the feed dogs go through, which I unscrewed to oil in there, was not screwed down tightly (sort of like my brain!). Tightened the screws and she is purring like a kitten. Laziness does not pay off (I did not have, or could not find, a screwdriver when I took it off and put it back, so I used a large needle!)