The Half Blow and its correct adjustment are vital to tonal control and evenness of touch weight (also this latter is primarily determined by appropriate Weighing Out of the keys – on this, more anon).
On sensible instruments (alas, not Steinways!) (though I did try to pursuade them otherwise…), spoons are fitted to the damper lift bodies for precise adjustment of individual key-damper interaction:
The required tools:
The lift transfer block & the spoon bender…