I just picked up a used 389-1. It’s. A dual needle postbed machine. From the needle plate up, the machine looks identical to my 255.
I’m having a weird tension issue on the left, bottom side of the work. It’s not every stitch just purely random. I think I’ve determined the issue is on the bottom somewhere, as I’ve put both of the upper threads on the left needle, and has similar outcomes.
Just wondering if any of you had ever seen this happen, and possibly offer a solution?
Yellow is the bobbin thread.