Don't bother with the reversing Y-harness.

The problem with them is this: Many servos travel more in one direction than the other.

For example: Lets say a servo travels 60degrees at positive throw and 55degrees at negative throw.

Now that you have reversed the servo on one side of the elevator, you have created a problem wherein one elevator half will move up; let's say 1" and down 3/4". The other elevator will EXACTLY mirror the first, BUT backwards. It will move up 3/4" and down 1".

I had this problem with a 1/4 scale Cap 232. Not pretty when you try to do a loop for IMAC. The plane will corkscrew through the loop because one elevator moves up more than the other.

A simple solution to this is this: Take the servo apart and reverse the wires on the MOTOR and the two OUTSIDE WIRES on the pot.

This makes the servo work backwards, and the throw will mirror the other servo in the same direction.

Hope this helps out.