|This tip is from the mouth of my Bernina tech. When it's time to change the thread on your sewing machine, never grab the spool and just pull the thread backwards through the tension disks. First, raise the presser foot, clip the thread at the spool and then pull the remaining thread through the needle toward you. If you pull the thread backwards, lint and other fuzzies can get caught in the tension disks. Some machines also have a little spring that can break.