This post hit a discord with me. Teachers are not sewing machine repair people. We might know our own brand of machine but do not know others. Contact the teacher before the class and ask if he or she might be able to help you with the problem and then make an appointment outside the class. Please don't take up class time trying to correct the problem. Take the machine to class that works for you. Also the one you will be doing FMQ on at home.
Another thing.....don't bring to class the Featherweight or little Jamone Gem..... You can't successfully learn on these little machines. Now what I just said has been my experience teaching many FMQ classes. Some people may be able to machine quilt their King size quilt on a featherweight but I can't.
Several years ago I was getting ready to teach my first FMQ class and called a friend from whom I had taken a class I asked her what she meant in the description by the statement "know your machine" and she said "you will find out". I did find out because two students picked up their new machine on the way to class which they opened up the first time and another student brought an off brand machine that her husband had bought her to use when at the summer cabin. Her's never worked and she kept saying "I hate these machines" . It just took up class time and denied the other students my full attention. So, my point is........get to class with the machine you know how to use and will be using at home.
I hope you will forgive my ranting this morning, but this subject just hit me the wrong way.