Even professionals who work with sewing machines can find it difficult to properly align the direction of the industrial sewing machine needle. Especially when your eyes get sore it is tough! If the needle is not aligned correctly horizontally, it is difficult to thread through the thread and can cause thread cutting, skipping and breaking. And the seams do not clean. How to use 1. Place the magnetic tip of the direction checker closer to the sewing needle 2. Put the direction checker on the flat part of the sewing needle "goug" on the right side of the needle or "thin grove" on the left side of the needle 3. Turn the needle to make the direction checker right next to the sewing machine (parallel to the needleboard).