For the March/April WaterSkier Magazine, Rossi put together this complete guide to fin tuning. Read it through and you'll know how to measure within a few thousandths of the pros, using tips for length and the apporpriate style to use when taking your distance from tail (DFT).
http://proskicoach.com/gear/fin_measurement/
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great article Chris, too funny about the "LOCAL FIN DOCTOR"...we all know one of those!?!