This lesson describes how to pass the Unit 2 test of the International Piano Technicians School using a Go Sharp Ease Flat technique with the hammer at 12:00 and using a gentle pull on the hammer to ease the pitch down to the target.It doesn't work on all pianos. In order to know what to do if this technique does not work, you need to understand all the lessons up to this point.

However, this video can be useful because it describes what to do in simple terms, without all the theory. It can be a quick way to get results but it doesn't replace the need to understand all the theory if you want to get superior stability on all pianos.

Here is a simple chart that you can use.