I am not sure exactly. We use a cutter that does an 18" radius cut but then we finish by hand. So, the radius might be different from one end to the other. We use a drop-off measurement for the 3mm side dot in the edge of the fingerboard of about 3/16" inch from center to the edge up and down and on all of our basses from 4-7 string. The original Burner 5 was copied from a late 80s BT 5 so it is what it is. Radius is a circle and the FB is part of the circle. Try measuring the FB from different points and see what it actually is. I don't have numbers. We just keep doing it the way we always have.
