Pianotech

Upstop rail.  Keeps keys from jumping out during transport or being lifted up to high.

This part is called the " key stop rail". This comes from the book Piano "Parts and Their Functions" by James Campbell. I purchased mine 30 years or so ago and I think you can still get a copy.  It's a must for communicating like this.  The part does exactly like its name stops the key from riding up the balance rail pin. If the keys are pushed up too high they will be able to move sideways across the top of the f try front rail pins.  Like was said it sit just above the top of the sharp key stick without trapping them (test by pushing down on the key stop rail if too tight the keys go down and the hammers will push up if too high the Sharp and natural key can be lifted a noticeable amount to thump when it comes down Which would be undesirable) 1 mm above the sharp key stick is a good number but how does one measure that?

Some vertical pianos have this part.  If a piano doesn't have a key stop rail, then the felt on the lower edge of the fall board or Name board will perform the same function.  Make sure you have the same space when installing this part and that you don't force the Key sticks down and the hammers up when installing the fall board. 

Jessica Masse RPT 

Western Michigan University

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