That isn’t actually hypothetical... about a guitar repair... Say one we’re to buy a used guitar. It feels perfect. It sounds perfect. It’s an incredibly rare color that you never see, is almost impossible to find, and you really like it. It’s already had upgrades done, and you actually like them! It’s what you would have done yourself. Everything about this guitar is the bees knees. But... The previous owner installed an LSR roller nut. And they didn’t cut the slot right. So the intonation on all your first position chords is crap. You didn’t notice what the issue was until you went to change the strings and tweak the setup when you got home... I have zero desire to return this guitar. I do not want to give it up. How hard is this to fix? Can the slot be suitably filled and recut? Even for a traditional nut? Or is this a case of I’m better off buying a new neck? I’m keeping it either way. Just want to know if somebody more skilled than I am could salvage this neck cost effectively.