Singer 301 Feed dogs won't drop
I have a second 301 that I recently bought and have been working on. Got it cleaned, and oiled. It was really gunked up. I sewed with it this weekend. Tension is great. However, I can not get the feeds dogs to drop. I turn the knob underneath the extension plate - and it turns and turns and turns and turns (unlike my other 301) but the feed dogs do not drop.
Any ideas on what I should do?