Published by the Piano Technicians Guild. The Piano Action Handbook includes regulating dimensions (key height, sharp height, blow distance, let off, key dip, back check distance and drop) for most pianos available in the U.S. and many parts of the world. Edited by Randy Potter in 1991, it includes dimensions published in the First and Second Editions, plus all piano makes and models regularly available in the U.S./Canadian market. It also includes a vertical and grand action diagram, regulating explanations and notes, SAE to metric conversion tables for common regulating dimensions, grand and vertical regulating sequences, manufacturers' addresses and contact information and a selected bibliography. Every piano technician should have this book in their regulating kit.