What if sewing is not needed for a long time?

For sewing machines that have not been used for a long time, clean the dust first, and then lubricate the place with oil holes. Let's see if the belt is loose, but it won't slip. If it slips, it won't go. Then adjust the suture to the appropriate position. If the stitches are too small, they won't disappear. It is said that your sewing machine is useless after a long time, and there should be no big problem. You're checking yourself. Be careful.