On a single short keystroke, the hammer is not even caught by the backcheck when falling back.
X
With a normal keystroke this does happen: after being caught (by the backcheck), the hammer rises again due to the spring in the bridge of the whippen.
X
Analysis of the action of a grand piano
High-speed film not only allows you to see even more precisely what happens in an action of a grand piano when the key is struck in different ways, but also the effect of different ways of regulating a grand piano action.
This can help determine where a possible problem lies.
On the right are two examples of what happens in an action during a short keystroke, and during a normal keystroke.
On a single short keystroke, the hammer is not even caught by the backcheck when falling back.
With a normal keystroke this does happen: after being caught (by the backcheck), the hammer rises again due to the spring in the bridge of the whippen.
