Weighing the Keyboard
To do this, place a weight (or sometimes more than one) on the top of the key and move it backwards until the rear
of the key drops down lightly and rests solidly on the backrail cloth. Then we mark the position of the lead(s) on the side
of the key. Here’s a picture of key #1 with two leads on it and their positions marked on the side of the key.
Moving a weight towards the rear of the key increases its effect. Moving it forward towards the front of the key
decreases its effect. Always start with a single piece of lead near the rear of the key. If the key descends to its
rest position too quickly, move the lead forward. If a single lead is not enough, place a second lead directly behind
the balance rail pin. Move this lead backwards until the key drops slowly but firmly onto the backrail felt. If two
weights still aren't enough, check for excess tightness at the balance rail pin and/or excess friction at the backrail pin
before adding any more weights.
Please Note: Weights must be added to the rear of the balance rail pin – never to the front. The further back
the weight is placed the greater its effect will be. Use as few weights as possible.