A bizarre phenomenon where a metal alloy used by Young Chang Manufacturing caused the parts to grow and break apart after manufacturing. The problem lies in that this growth changes a key dimension of piano action regulation, making it impossible to regulate the piano correctly. This video outlines the details of how to solve the problem.

Young Chang Grand Piano Action Replacement Procedure in Detail: https://drive.google.com/file/d/1m42y...

Action Bracket Types: https://docs.google.com/spreadsheets/...

Pianos Affected: https://docs.google.com/document/d/1z...

Parts Contact for Purchasing (Not Affiliated with Salt Lake Piano Service): https://docs.google.com/document/d/17...


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00:00 The Problem
00:26 What Pianos Were Affected?
00:42 The Solution
01:12 Fitting the New Brackets
08:56 Setting the Correct Action Spread
11:34 Regulating and Checking for Problems
15:28 Reassembly and Cleanup