No matter how advanced or sophisticated the sewing machine has become, the basic principle of selecting the correct needle to be used must still apply. Quite simply, the finer the fabric the finer the needle, the heavier the fabric the heavier the needle, but whether fine or heavy it is important to replace your needles regularly. In order to achieve the very best results from a Janome Machine, we recommend that you use the correct Janome needle for the fabric you are using and that they are changed approximately every 8 – 10 hours. Using other brands of needle may cause stitching issues as they differ in length to Janome needles and are structurally different.