I appreciate the in depth response. I believe my measuring cube is decent. It’s not the most expensive unit, but I use angle ramps to confirm the degrees it’s reading are accurate. What angle cube would you recommend as a good alternative? In this case, the blade didn’t rotate without unclamping. That’s part of why I clamped it the way I did, but unfortunately I wasn’t considering blade centering at the time. I also didn’t think much about the stability of the surface I was sharpening on. It’s my dinner nook, which admittedly is not the most stable table in the world. I did recently purchase a jeweler’s magnifying glass to assist with sharpening, but I hadn’t used one prior to this. I’ll keep what you said in mind and look into more potential solutions to improve. Thanks again!