Do you happen to know what way the needle goes in? When I looked at it, the needle was facing a different way than the needle in my machine, which is a Kenmore from the 70s. The manual didn't say.
I did try reversing the thread in the bobbin. The manual says to 'pay close attention to the bobbin as you take it out and make sure it goes back in the same way,' which doesn't do me much good sixty years later lol
I will give it a good cleaning this afternoon when I go over there to look at it again. Make sure there's no lint.
Thanks!