Apologies if this seems like a silly question. When you have finished sewing for the day how should you leave the Presser Foot, up or down? I leave it in the down position with the needle at its highest point because I think when it is up there is a certain amount of stress on the mechanism. But I seem to have read or heard somewhere that the Presser Foot should only be down when you are sewing therefore up at all other times. Or, does it matter?