Thank you everyone for letting me know about the prewound bobbins..I do have the commerical bobbin winder that came with the machine and I have been testing the threads that I have fining out that some spools are fatter than other and need some control on the thread to make a tight bobbin. I just purchased a Tin Lizzie Ram just the right size for me and my projects. I have a lot of embroidery thread and I plan on making good use of it with both the long arm and the embroider machines i have. Thanks again very one for your help..I am going to need all I can get as I am very new to the long arm.