- Squaring Platform
- Shank Traveler
- Hammer Square
- Hammer Hanging Jig
- Hammer Filing Jig
- Regulating Rack
- Keystep Sampling Kit
- String Height Gauge
- Custom Keybed
They assure well-shaped hammers rise vertically and address their unison strings vertically. The three dimensions of strike are located and set up reliably out of the piano. There, prep work and regulating methodically proceed in best order.
This work includes making friction appropriate and fine balancing the action.
Back in the piano, unison strings are fit to the vertical hammers. Because hammer crowns are horizontal at strike, the strings will be horizontal, simplifying delivery of energy from player to soundboard. And improving damper efficiency and soft pedal voicing.
The Grandwork System achieves this horizontal-to-horizontal mating without distorting hammer shape. The improvements to power and repetition gained by making parts vertical simultaneously improve both hammer shape and string level.
The accumulated effect is best voicing prep.