After constantly struggling with trying to consistently measure DFT, I have designed a tool that provides a way to measure the "Full DFT" on a ski and do accurately.
In addition, the tool allows you to measure depth without disturbing the wing. The "Full DFT" measurement will be longer than measurements currently used. If you are just making a DFT adjustment it shouldn't matter, If your sharing specs, it should be simple to figure the conversion for your ski. Connelly has the Full DFT measurement for the Prophecy on their website. With the EZ Fin Tool, you can check all three fin measurements in about a minute. For anyone attending the Western Regionals at Laku, I'm a member and will be there all week, look me up and give it a try. I will have a few with me to sell if anyone is interested. Price will be $40.
Attached are some pics.
Terry Bandel ezfintool.com AWSA Regular Judge & Driver