pick any random lobe and point to up or twelve o'clock
between 9 & 3 is the base circle "Measure it"
between 12 & 6 is base circle & lift to point of nose "measure it"
take first no- away from second,,, eg; 40.00mm - 29.00mm = 11.00mm lift.
Req' mic' or vernier calipers to do it this way
anyone else