this may be a silly question, but if you can measure it accurately how do you plan to draw it accurately? Are you just drawing this for fun?(not production).
if you look at the part, the outter edge of your ratcheting teeth have a wider peak than the inner edges. I would draw your cylinder, then draw a triangle in the center of your circle, extrude(cut) it out from the center then do a circular pattern. I havent seen anything like that in the content center but then again ive never looked for it