The fuse on the 18x8 machine may blow because of 2 reasons. When starting to quilt do you bring up your bobbin thread each and every time before beginning? This process is very important to keep the bobbin thread for getting stuck in the bobbin case or race. The handwheel will seize and blow the fuse. The fuse you need to replace it with is a 4amp low blow fuse from radio shack. Part # 270-1066. The second reason it will need to see the sewing machine tech at your Dealership. It is internal. Hope it is nothing serious.