So this gap where the neck meets the body bothers me.

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I got a piece of scrap mahogany and started shaping it.

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It's taking form. Lost the light before I got it quite all the way there. Still more to do.
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I'm going to try and make it follow the same curve as the neck was following before it turned parallel with the body.
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(Not the sharp change this image shows, I haven't started on that edge of the piece yet.)

However, since the original has a rounded edge when I place my flat piece on it there will be a small gap. (Or a step before the curve continues, and I don't want a step.)

I'm wondering if the behlen grain filler will set hard enough to bog this or if there is some other putty type thing I should be putting in there to make the transition smooth.