Kenmore 158.1040 sews!
I finally got the 3/4 sized Kenmore machine to sew a zz! Thanks to everyone who kept encouraging me to keep at it. I finally got the Tri-Flow oil and that seemed to be what she was waiting for. But she's going to have to stay a dedicated ss for now until I find a zz plate for the machine. She weighs in at about 15lbs and sews a pretty stitch.