Learned something new about my Singer the other day. Got myself set up for FMQ. I changed the needle and switched to my darning foot and commenced to quilting. I noticed that I wasn't having the eyelashing and tension problems that I normally pull my hair out about and figured it must be the thread. Well, been using that same cone of thread for some time. When I ran out of bobbin thread I noticed my feed dogs were not down when I switched bobbins. I had been quilting the whole time with the feed dogs up!
I have no idea why the machine still lets me smoothly FMQ, but needless to say those doggies are staying up! I hope it doesn't hurt the machine.