Doctor Bob at Superior Threads has some wonderful information about threads, tensions, etc. I would suggest that you contact Superior Threads about the problem. I use a lot of their thread and never have problems when I follow the instructions. I also am careful to clean lint out of my machine frequently. I oil the hook and race mechanism when the maintenance light comes on as well. I hope you get your problem solved soon. I am sorry for the loss of your husband. I know that turning attention to something pleasurable will ease your grief. Do you have a friend who could help you.