I have a Singer Touch Tronic 2010. My problem is the bobbin will not wind unless I press on the red lever. I had it worked on for that reason. It still does not work well. It seems there is a little bar comes up to fit in bobbin could it be my bobbins are damaged or is there a more serious problem? I have not had it serviced for awhile how often do these machines have to be oiled. Do they make Metal Feed dogs for this machine? Thanks Marie