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Pappy, the body is the one that doesn´t change (a little with the years)... the back of the bow changes in distance to the string when the same body open a bow with a more or less deeper handle.
So, if you are pulling from the string to your palm say 26", if the handle is 1 inch deep, your draw lenght would be 27". But if the handle is 2 inches deep, your draw length would be 28"... measuring from the string till the back of bow.
If the method is this one, is necessary to specify what kind of handle every one have used to find its own draw lenght. Otherwise makers and users could be talking about different things.