Originally Posted by cycross

So I had the same bugbears, the odd rudder servo mount angle and there was some play for the left rudder due to whatever fit issue there was.
I tried visualising the spatial gap with some blue tack or foam tape, and then attempted to fill the gap with kneaded metal epoxy. Didn't work, it won't stick.
Short of a bendy scope, I couldn't make out what's exactly causing this free play.
I minimised whatever free play now there was by making sure the servo wasn't able to rock sideways along the height axis, which helped some.