While I have used forked pushrods as pictured with success, I also lost a prized Extra to one. The bends allow a little sponginess and can allow flutter. I flew the Extra for several seasons before elevator flutter in level flight took the whole elevator, 1/2 the stab and the rudder off the plane. This plane was set up with carbon arrow shaft pushrods but the "pickle fork" at the back end made the control system too soft for me.

A better solution for forked pushrods is to fork them at the other end. Essentially giving you 2 separate pushrods that are tied together at the servo end. This allows you to keep the pushrods straighter, giving you less play in the control system and less tendency to flutter. When forking a pushrod this way, I just use 4/40 wire pushrods for the full length. I wire wrap and silver solder them together at the servo end. The pushrods are set up for straight runs from the fork to the control horn and are supported at several points along their run.

This is the way I set up my Dirty Birdy 60. It gives solid controls with no push rod flexing that is much less prone to flutter than a system with the fork in the rear.

The same could be done with wood or arrow shaft pushrods if you've a mind to and have room in the fuselage.

Dave