Hi Gary- the neck end of the soundbox was about 1/4" thick, so I just finished filing/sanding the outside of it where the neck attaches to a wedge shape. It looks like it should work- it really straightened things up. I didn't have to do anything on the inside where the neck block goes. I'll post a picture in the morning, I've reached my limit for today!
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Could you make a tapered shim for the short side?