[amsat-bb] Tilting Yagi up 15 degrees above horizon

With all the talk about tilting a Yagi 15 degrees above the horizon and using a rotor in azimuth only, I have a question. Since every Yagi I have includes mounting hardware to mount the antenna at a 90 degree angle to the mast, how do you tilt it 15 degrees? Do you put a bend in the mast pipe? Can you purchase hardware to allow the Yagi to tilt relative to the mast? Maybe everyone knows a simple answer but I will admit I do not.

Thanks and 73,

Rick - WB3CSY