Jim,
When I said "humming" I meant rattling of the wire or playing like a guitar string when the engine is running. The system is totally quiet at neutral. I might add the JR pull-pull servo brace if it still cold tomorrow!

I also forgot to state that I first reduced the mechanical advantage of the rudder by going a hole in on the servo arm.

The O-ring is not very tight on the wires and just acts like a damper.

Regards,

Captain Cabin fever...