Originally Posted by
tesspug
A leader is a small piece of fabric you feed through just before you put your pieces in. The leader will catch all the loose thread so its not on your seam. Just use a scrap of fabric. Some people also use a scrap at the end and then just leave it there as the next leader. Then you cut the leader off and leave on the side of your machine to use again.
This is excellent advice. Since I've begun using the "leaders and enders," piecing is a cinch. It also conserves thread.
Happy sewing to you.