It's a borrowed image. The last time I saw my old one (it came into my hands for a small repair) the brass was heavily tarnished and someone had totally wrecked the very basic wiring.
The top image depicts up-bow. Up-bow is initially rectified by tightening the truss-rod, not g it. Loosening it would make the up-bow more pronounced, no?
Indeed it does. But I do wonder how long it's been like that.
I'd be hard-pressed offering them £150 for that. A bit of a nerve being coy about that crack.
Correct. I once saw a Taylor acoustic with such a crack, caused by continual tightening of the the truss rod to counteract an up-bowing neck. Unfixable. The guitar had to go to Taylor for a replacement neck.