Thanks Lisa. As a matter of fact, I had already ordered an extra bobbin case, and you can bet I will not be messing with it. I had seen some ideas where you have one to "mess" with and one to leave alone...I also know that with this machine, I have heard you have to be a little brave and do some adjustments you may not be used to...like with my PC-420, it is auto...and I go :-D Can you tell me what size and brand of needle to you have the best luck with? And thread, too? Thanks again!