Dropped my Kay off at a local luthier, his opinion was the original neck is toast, but the reason I'm here is he was being really weird about my string choice, in fact I think he's the first person I've ever had be weird about me using flats, and it's on the wrong instrument to be weird about it at that.
As I've said here before I strung it with 9050Ls, not exactly a strange pick for a bass, 45-100 steel flats. I'd call them pretty typical strings, but the guy was really, really pushy about how much tension it puts on the neck (less than a fifth string, and it's not like basses with those are uncommon) and kept trying to steer me toward Ernie Ball Slinkies (he shoved a pink pack into my hands but 40-90 came out of his mouth... I'm sure you can see the discrepancy) without a single prompting on my part and despite my best attempts to tell him "hey, I intentionally put those 9050Ls on there recently [so they're still good] because I know what I'm doing" with basically just a little bit less neck tension and them being "slinkier" as the main selling points... which maybe they're true, I don't really do bends on bass (and barely on a normal Spanish for that matter) and there aren't 0 people who run 55 flats with perfectly healthy necks so neither are applicable but I suppose they're true. It's not quite enough to make me doubt him entirely, but I do kinda wonder. If nothing else he's at least somewhat condescending.