General prop alignment guide;

With a plane level and the plug pulled from the engine, place an object as close to a propeller tip as possible when the prop is vertical. Measure the distance between the prop tip and the object. Swing the prop to where the other blade is now positioned next to the object and measure again. If there's a significant difference, change props.

Sometimes the hub is not flat and can be sanded to correct but it's a lot of work to get right. Better to change props. Poor blade alignment contributes greatly to vibration and can cause a blade to be thrown in flight.