I didn't PERSONALLY think the dark line looked like a gap (I somewhat stated that when I said 'It'd be foolish to try to make a structural claim about what's going on there'), I was referring to whatever is going on to the left and bottom of the joint, right near the corner on the neck itself; not sure if that's filler or what. I was just stating that it wasn't an especially attractive joint and if it's a ton of labor having to tape, spray, polish and reclean the spot to where it becomes an issue on a short deadline, that might be something to take into account in the workflow, rather than spending an outsized amount of time cleaning it up every time. And you've been doing this longer than me and you've placed hands on all these, so you'd know better than I what's possible but that's what feedback and constructive criticism is about. I'd hate for legitimate conversation about this to get lost under a pile-on. Maybe a dumb question, but is it possible to glue in the neck AFTER finishing? Would it be completely non negotiable to make it bolt-on instead, if it saves a few extra hours work per guitar and sounds just as good?