In a message dated 4/20/02 9:18:57 PM Pacific Daylight Time, hphillips@mho.com writes: > Anyone know if a HDR-300 rotor will into the top section of a US Tower > HDX-555, my Tail twister fits ok. I'm going by memory but I think the answer is no. It's not a standard CDE/Hy-Gain bolt pattern. Cheers, Steve K7LXC TOWER TECH - Professional tower services