Yup, the Y-extension is the easiest fix. I think the OP confused everyone by posting to the beginner forum instead of somewhere like the ARF forum. He said this is his first ARF but that he already has flying experience. It wasn't clear if he might have had building experience or not. But I do agree, if he's not comfortable with the idea of building the Y-pushrod, the Y-extension is the way to go.

It was designed for dual servos. How could this possibly be detriment in wt & balance. Don't you think the mfg thought of this. They have built a few of these by now ya know and they have worked fine. Case in point would be the one MinnFlyer built for his review.
Use dual servos & Y-harness, forget the other Mickey Mouse stuff. If absolutely necessary add a reverser but I don't think MinnFlyer used one.
Good luck.

If you read the review, Minn said, more than once, that 2 servos for the elevator was overkill. I also recall that it ends up heavy. So, it seems the design is not necessarily golden, and the discussion about alternatives is perfectly reasonable. What's wrong with a discussion about alternatives?

I fully agree that it is overkill but the weight of one servo is not going to overburdon the plane and in fact would probably not be noticed by the average flyer. I'd rather see the weight there than back on the elevator in the form of some kind of bracket and start cutting up the plane. I also agree that a Y-pushrod would be fine but that didn't seem to be going over too well either. Great Planes has an interesting method of doing a Y-pushrod in the ARF KAOS-40 that works. Are you familiar with it? They just clamp the pushrods together with a wheel collar and run a single wire to the servo. Kinda strange to me but it works.
BTW, I read the review or I would not have referenced it.
As for heavy, it is advertised as 7-8 pound plane and MinnFlyer's came out at 7.5 lb. A different engine may changed that one way or the other but he did not complain about the wt in the review.
That all. I'm going flying

I am a bit confused as to what the "Y" extention should look like. Does it involve taking the servos out and re - fitting the pushrods?

By ""Y" extention " do you mean Y-harness or Y-pushrod?

either, im not sure how the setup would look

Two y extensions are being discussed. I think the consensus is the easiest solution is to use a y SERVO extension. This is simply a wire that allows you to plug two servos into one receiver channel, in this case channel 2. This way both servos are controlled by one channel. Here is an example. http://www2.towerhobbies.com/cgi-bin...&I=LXL307&P=ML

This an adapter which you plug into your rx and you plug 2 servos into it. Both servos should perform in an identical manner. From what I saw in MinnFlyer's review of your plane it already has 2 pushrods installed (one to each elevator half). You would connect one pushrod to each servo and both servos to this adapter harness and the adapter harness to your rx. There will be a very slight weight penalty but this is what the plane is designed for.
Adapter:
http://www2.towerhobbies.com/cgi-bin...?&I=LXH451&P=0
While this particular adapter does not physically "Y", it can be referred to as a "Y". There are others on the market that do physically split if your servos are further apart (like in the wings).
A Y-pushrod is a mechanical thing. It is done in several ways. I'm having difficulty figuring out how to describe it to you so you will understand. Is there anyone local that can help with this?
Here is another Y-harness, although it is too long for you it will help you get an idea: http://www2.towerhobbies.com/cgi-bin...&I=LXL307&P=ML

MinnFlyer- Got ang drawings?

phil - i really hope that although this may be your first ARF build, you are not a beginner. if it is, you should let us know so that we can give you a barrage of advice telling you that this is not a good plane for you. if, however, you've already mastered the trainer, then good luck!