Piano Jack Spring Replacement
If the jacks in your vertical piano aren't returning very well, it could be that your jack springs have become weak over time. Replacing the jack springs in an upright or vertical piano is a relatively easy task. There are two different sizes of springs and you'll want to try to get a measurement to make sure you replace the springs with the correct size. Here are links to the needed items for this job:
Parts and Supplies Needed:
Products used in this video: