Patrick Johnson said:Ed Young (Chicago partner of Ed Kersenbrock) made mine to my specifications: 1-piece maple, 10mm diameter tip, 1/4" ferrule, hollow first 6-8", straight (conical) taper from tip to joint.
It hits stiff with extremely low squirt (lower than OB-1 or Predator). Cost $150 a few years ago.
pj
chgo
Logic would say that 10 mm diameter shaft (first 6") or less will work - less mass and more flexible that a 13 mm.