Oh ok! Thanks for the bobbin-winder adjustment info! I didn't know that! I had to adjust tension on the machine and the bobbin.. of course I'd have to mess with it there too!!
It doesn't change stitches no matter if it's set on 0 or on 5 (or anywhere in between!) I can't figure out how to get to the innards, except through the bottom, but nothing seems really stuck or hung or stiff. I have the feed dogs up as high as they will go, and it's straight stitch only.
Thank you for your help. I'm really enjoying playing with it and learning about it.