It helps prevent confusion if we all use the same terminology when describing instruments, and the terms used for dulcimers are not necessarily the same as those used for other stringed instruments.
Mountain Dulcimers have a head block, a scroll or flat tuning head, a tail block, two sides (usually), a top, a back, a nut and bridge (but no saddle usually) and a fretboard which may also have a fingerboard on its top. Some have feet on the back.
A "heavy, square" tail block is not necessarily a Galax style element; many instruments from different regions have large tailbocks of various shapes. What normally distinguishes the Galax is it's double back, it's wide (7-10") elliptical shape (not teardrop), it's extreme depth (2.5" to 3.5") and usually 3 strings of the same thin gauge tuned normally to ccc or ddd. Check out Kudzu Patch Dulcimers -- Ben Seymore is the "king" of Galax instruments...
updated by @ken-hulme: 12/18/20 04:34:12PM