How is it done?
In the next photo I’m applying heat to a key. The entire key doesn’t need to be heated – just the area near the balance pin hole. Don't let the heat gun get too close to the keystick as it will scorch the wood.

In the next photo I’m applying heat to a key. The entire key doesn’t need to be heated – just the area near the balance pin hole. Don't let the heat gun get too close to the keystick as it will scorch the wood.