Thanks. The double stitch, as you probably know, is done with a length of thread with a needle on each end. You are actualy crossing the ends. You go through the bottom side of one hole with one end, and then through the top end of the same hole with the other end. With that same end, you go back up through the bottom side of the next hole, and repeat, repeat, repeat. You can see that this would take a long piece of thread to go very far. When sewing a belt, I'll only use a lenght of thread short enough I can handle it. When I'm about out of thread, I'll stop and get a new length of thread and start sewing with it a couple of stitches back from the thread I ended with. After I pass the old thread, I'll cut the ends nearly flush and push them down into the stitching groove. I used waxed linen thread, and it seems to stay in place this way.