As I posted in somebody else's ES-3 build.

I've been thinking these builds through a fair bit before starting them, and feel that with a little work the ES-3 design where the neck meets the body could be improved.
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If I just left things as they are, I would have a gap between the binding and the body showing on the left, a similar gap showing directly behind the neck heel, and a likely gap where the body meets the neck on the right.....the latter could be sorted if there was a way to clamp the neck / body sideways, but there isn't, so another solution had to be found.

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The solution is to cut some appropriate wood to extend the heel, this would A] Cover the offending gaps that would be there if the neck was fitted normally , B] Cover the gap on the right that couldn't be covered in any other way.

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So that's what I have been doing to day, cutting the wood and gluing it to the neck heel on both builds.....I'll sort the other extension for the right side of the ES-3's neck once I've shaped and sanded this portion.