A pushrod that is forked at the back end of the plane can lead to trouble. It allows too much flex and can allow flutter. I lost a Goldberg Extra this way. A much better method is to run two full length pushrods and attach them near the servo. This is exactly what the DEPS that Jon mentions is. The DEPS is carbon fiber pushrods but the same thing can be done with standard steel pushrods. Use two full length 4-40 steel pushrods and run them as straight as possible and solder one to the other just short of the servo end clevis. Be sure to brace the pushrod guides. This is the way I set up all my old school pattern planes. Here's a picture of the pushrod I made yesterday.

Dave