Originally Posted by fabric_fancy
if none of that works just open the bottom and flip the toggle - most machines its just an internal toggle that the outside level moves.
i've had to do it a couple times on my old singer machine
This answer really helped me. There may be an internal toggle, but, it isn't visible. So I put the toggle in the down position, lifted the feed dog with my finger, then put the toggle in the up position. It actually worked!
I would not have figured this out without your help. Hugz! Now I can sew!