I'm by no means a carpenter now so these are just my thoughts. It's easy to use but doesn't really include the instructions and diagram that it comes with. I have no idea what it is or how to use it. It would be nice to get some instructions on how to use it for people who aren't carpenters who you presumably sell it to. If you don't mind, could you explain what this chart is for and how to use it? Oh, and it feels solid and doesn't wobble, which helps a lot to keep the angle 📐