Tom, how does the new bicycles geometry compare to the old bicycle? What 10Wheels and Curdog said will help if the geometries are pretty close. I tend to favor Curdog's idea of startng with fore-aft placement and working from there. Just change one movement at a time, however.
Bill
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Semper Fi, USMC, 1975-1977
I Can Do All Things Through Him, Who Gives Me Strength. Philippians 4:13