Spaw,

A tight fit at any joint has long been a desired achievement.

Gougeon Brothers WEST Epoxy was some of the first epoxy used as a cell encapsulation of wood technique. Generally an entire hull was covered in epoxy, the seams filled with micro balloons and epoxy. This was an effort in economics to save hulls that were marginal at best. Usually it was a success.

I can't think of a place I'd use WEST on an instrument as a standard technique however.

I have built a dozen lap dulcimers of Blackwalnut over the last 20 years using Elmer's white glue and/or Tite bond with universal success. I agree that the glue should match the job. But back to the original comment, double entendre aside, the tighter the fit the better. I have matched spruce tops on dulcmers with such a nice fit that no clamping was required for a tite glue joint. Wish I could say they all fir that well. :-)

Don