Try playing with the tension.....upper and lower and see if it helps..try different stitch sizes...does it look like the cone thread has burrs on it? Did you try a different cone? That is what I would start trying...I've used cone on my Featherweight using a cone stand and it worked for me. Good luck

Yeah, and my thread breaks - a LOT! And my bobbin isn't wound as tight as it used to be... And my light goes off now and then... And my seams sure aren't very straight now. And I frequently zig when I should have zagged... And I sure don't get through the thick stuff like I used to. I don't think replacement parts are available for my model. Oh well - I'm still fairly useful if you arem't looking for perfection! LOL!!

I learned to sew on a Singer sewing Machine and remember quite vividly how my feet used to go like gangbusters on that thing. Here is what I have done with mine. We took off the top completely including the belt. Gave the iron base a fresh coat of black paint( looks great), and had a piece of lightly tinted tempered glass with slightly rounded corners( no sharpe edges) put on the top.The glass cutter gave us some small fancy flat fasteners to attach it to the base where the original screws held the top originally. I have it in our front foyer and use it as a table to put whatever seasonal decor I want. At Christmas time one of my larger Dept 56 Dickens Village pieces and accessories make a very nice entrance to the house.I hve also thought that a nice piece of marble on the top, would work well with the iron base perhaps in a kitchen.

I use cone thread all the time. I have a spool holder so the threat comes up and feeds through my machine and doesn't catch on any moving parts. They are inexpensive to purchase, (less than $10) or you can google how to make your own. There are several DIY methods of making one. Good luck! Sue