@dylan265 been there with that Starrett square, those are solid tools. What gets me is that most folks never think about the fence face itself being warped. I checked my old saw's fence with a straightedge and found a slight bow right in the middle, maybe half a thou off. Clamping a square to a fence that's not dead flat can give you a false reading if you're not careful. Had to shim mine with some aluminum tape before I even started squaring up the blade. It's one of those things that makes you question every cut you ever made before.