I note some indifferent butting of the linings to the heal block
It was most likely in that state when the uke was put together...they didn't envisage that someone would one day peek at the deep inside of the instrument.
What is "butting"?
"Butting" is not used in the sense of something that the Greeks used to do, but a term for attaching two pieces of wood together in a joint that lies flat to each other thus the "butt joint".