Black locust bowmerang

[Mulberry River]

Now that I've worked this Black Locust stave down to the best ring, I'm wondering how best to draw that "shadow line" down the back of it. The stave has a lot of potential; very high ratio of early/late wood & some nice reflex on 1 end. Do I pull a straight chalk line anyway I can to make it fit or try to follow the grain, or what??

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 http://i159.photobucket.com/albums/t137/storeylh/Black%20locust%20self%20bow%20Feb%202010/000_0070.jpg

[Mulberry River]

Now that I've worked this Black Locust stave down to the best ring, I'm wondering how best to draw that "shadow line" down the back of it. The stave has a lot of potential; very high ratio of early/late wood & some nice reflex on 1 end. Do I pull a straight chalk line anyway I can to make it fit or try to follow the grain, or what??