Hello RR: Suggest a Hy-Gain Ham V rotor, more money but will last years and years.
Its always easier to put up antennas, rotors, and towers doing it right the first time. More enjoyable than being out when its raining trying to fix something from a cheap design.
I have mine up at 75 feet turning a Crusader 10K, 5 Element Yagi Beam. Got it in 1972 with my Moonraker 4.The Moonraker was scrapped, I kept the rotor, still working. I am sure theres used ones out there.
Jay in the Great Mojave Desert