<html> <body> Hi David,                  With an average up weight of 28gms, I would seriously doubt  there is too much lead in the keys.  Too much lead tends to give you an up weight of 50% or less. I know an over generalization.  <G> My money is still going to be on the balance rail hole.  The problem is far more endemic than we think. Regards Roger At 06:55 PM 7/11/2006, you wrote: <blockquote type=cite class=cite cite=""> With respect to the question of how many leads it has as much to do with position as number and really boils down to the overall front weight of the keys.  If there are a lot of leads or if they are all pushed way forward on the key, a high measured front weight can introduce inertial problems such that even if the static weigh-off is light the dynamic performance can suffer from a feeling of sluggishess.  That’s why overcoming weight problems by simply adding more lead can be counterproductive.  How many leads and their position in the key will give you a quick indication if there might be a problem in this area.    </blockquote></body> </html>