Knife Sharpening Angle Clip (±20°)

+- 20 degree level bubble holder to help learning the correct angle to sharpen kitchen knives for the level bubble I used this https://amzn.eu/d/8KDjKK0 Diameter of the sharpening steel (Wetzstahl) 9.65mm I used PETG but I think anything is ok How to use:check if blade is dull with paper test (can it cut through paper?), if dull: continuePlace tip of sharpener on counter topmove sharpener handle up until bubble is level for +20degreehold knife flatmove blade edge 2 times with little pressure through sharpenermove handle down until other bubble is levelrepeat from “hold knife flat” 5 timesrepeat from paper testIf knife does not get sharp, you need to a stone or any other abrasive sharpener