I always pull up my bottom thread, then I take two or three small stitches which makes the stitches so they don't come out. I have never heard or putting the bottom thread through your needle, I would think it would make the line look thicker for a little ways, but it would lock your stitches in place. Oh, I think I know what you mean, when you are finished quilting, you take a regular needle NOt on the machine but a regular sewing needle and work the ends in between the back and top to hide the ends9like you when you are hand quilting) and give it a little more security from coming unquilted. Am I making any sense at all. Hope I have helped, and not just confused you any more than you were. Good luck. Just remember to relax, and try to enjoy it.