I was told by quite a few people and its on a website but i dont remember wich one.Using one bolt or nut doesnt squish the prop down even so if ya say you put a metal pointer on the head and secured it,then put one blade against it,then turned the prop 180 degrees,it wouldnt be the same in most cases.I havent tried it yet.But the website i saw it on gave a description on how to do it.You start at one bolt and then like tightening a wheel you move from corner to corner in x's and rotate the prop to make sure the prop is squished evenly and both blades track even.The site said you would definatly gain RPM numbers.I just started to fly helis and believe me,you want the 2 blades tracking even.Thats why one tip is one color and the other is different.Ill try one of my wood props this weekend and see.If i have both hubs for one engine.