I have swamp ash body, myrtle top, bolt-on with a slightly larger than business-card-size ,side neck pocket gap on the bass side. There is also a small gap on a decorative curved extension of the neck into the body. The extension gap is very small. Just the sort of small error that creeps into mass production. The neck is stable and straight, and as far as I'm concerned, the gaps are purely a cosmetic issue. I'm not an expert, but I don't think much vibration is lost. However, I'm obsessed and I'd like an elegant, aesthetically appealing solution to close the gaps. I can live with the small gap on the extension and it is probably harder to fix elegantly. The side pocket gap is more troubling. I can use a small shim, but I would like the shim to blend with the body. Suggestions? Techniques? Other solutions? Hambone's resin technique?