I noticed you guys talking about servo horns and wanted to throw out another option. I bought Dubro horns the same time I got the HS-55's and they worked pretty good. They fit the HS-55's correctly (no excessive force required) and are about the same thickness as the OE servo horns so they don't have to be sanded. The hole will have to be drilled out to accomodate the linkage. This actually worked to my advantage because there was a little bit of slop between the hole in the OE horn and Z-bend that's gone now. The only thing is I couldn't get one of the horns exactly parallel in the neutral position so I used the linkage adjustment to compensate.