Adjusting Let-off on a Grand Piano

One of the steps in regulating the action of a grand piano is to adjust the letoff.  This is the adjustment of how close the hammer comes to the string before the jack releases it.  The above video demonstrates how to make this adjustment.  Here are links to the tools used in this video:

Parts and Supplies Needed:

- Capstan Screwdriver
- Capstan Regulator with Wood Handle
- Magnetic Letoff Strip
- 6" Stainless Steel Ruler