Key Lead Placement

[Farrell]

I have read material that suggest placing key lead close to the center rail, and other material that suggest to use a minumum of lead and place it out near the front of the key. For a given balance weight, what guidelines do listy folks use for lead placement?

Perhaps just do the 3-2-1-0 arrangement and let them fall where they will placement-wise to get the job done? Any rules like "no closer than X mm from key end.....?

Terry Farrell