Gutterman, coats and Clark's should work in your brother. I have used both in all my brothers since I started 13 years ago. I also have used mettler, connecting threads, sulky,and Madeira. Glazed cotton should not be used of any brand. I'm not sure you might want to ask if you have to have it cleaned I don.t know if the glaze can cause problems in your tension discs. I did that in the beginning and mine was fine after servicing but that was so long agoim not sure what I did to get my tension back to normal