I have a Gammill classic plus I use coats & clark dual duty text 40 and coats multi color #50 I don't like others have to mess with tensions and I want to sew not mess with pokies or loops I order from Atlanta thread & supply company but they are switching to signiture and guttermann their sales person said Gammill user liked the guttermann switch with no problem and did send me a small spool to try but as of yet need to make a pink top to use sample. I do agree if get small spools are not as heavy as large cones even though SAY the same on label.