My buddy runs a small bakery and was about to drop 80 bucks a month on some AI inventory app. His mom, who did books for a hardware store for 30 years, looked at it for two minutes and asked how often the app guessed wrong. He said maybe once a week. She told him then you're paying to fix a problem you already know how to spot. He kept his spreadsheet and bought a second used rack instead.

That line about the head getting knocked out of true is the part most guys skip, and it's the one that bites you later. I've chased a chain walk for a whole afternoon before I finally put a level on the head and found it was off just enough to matter. Bent holder plus three teeth fighting is a lot of force, and something had to give somewhere else too. Check the spud alignment while you're in there, it's ten minutes that saves you a second tear down. Fix the tooth, sure, but don't trust that everything else stayed put, because it usually doesn't.