I have machine out of shop, guessing I am moving machine to fast for the bottom thread is not neat looking. Or is it the tension? When I do curves the bottom thread is not in the fabric and looks to be pulling top thread tight out on bottom. When I went to pick up machine the man who worked on it and said he would show me everything I needed to know about wasn't at work. So all I got shown was how to thread it right, which I was doing wrong. Please tell me all I need to do is slow down to get it right. Lady didn't even plug it up just put sample in machine and turned the wheel with her hand to show me the stitches were good now.