Yeah I meant to say "tailwheel"... I'm still not typing properly after my last incident with a propeller many months ago...

Flutter is when the control surfaces occillate rapidly while the plane is moving at high speed.

If the control rods can move from side to side, the surfaces will move up and down in turn, and you'll get a flutter condition.

You want to prevent sideways movement of the long control rods.

The connection to the servo arm is not what causes the problem. Think of a string on a guitar or piano... it moves from side to side... so can the long rods.

By circling them with light ply "guides" you can minimize or prevent side to side movement.

This is very easy to do, just cut a hole in a small thin square 1" sheet of wood. and epoxy against the formers... just make sure the rods can travel back and forth freely.