I removed a shim from the back of a neck heel the other day.
yes the back of it, the action was high enough to limbo under, a bloody slab of wood, for the life of me I can’t understand the logic.
But apparently performed by a tour technician.
I could see the gap at the back instantly, I thought the bolts had pulled loose and the string tension was ripping the neck free.
The guy loves his bass again now he was having difficulties with it apparently…