about 3 months ago I was given my grandmothers sewing machines. Both are singers, one is a 9410 (the last machine she bought before passing on) and the one it replaced, a 758 touch n sew. I remember her useing the 758 so I set out to get it running agin. I quickly found the problem. The plastic gears had broke 2 teeth on the bobbin/dog assembly. So I ordered those and replaced them. As I started to re time it everything looked good then the other set of gears sheered teeth. So agin I replaced those and went to time it agin. This time the drive belt lost teeth. And after seeing what was going to be a chore to do I moved on to another machine. I will probably never buy another tns except the older ones. A buddy snagged a 600 with cabinet for me for $5 at a yard sale. When he dropped it off I seen the TnS badge and thought, well poop. It has a nice cabinet at least. When I tipped it back and pulled the cover off I knew then I had a good one. All metal gears! After fixing a wire issue and a good oiling the thing runs like a champ. And the auto wind bobbin works smoothly.