If you're using Nyrod... Install two tubes, and near the servo, have them both aligned so that the pushrods will meet the servo arm at the appropriate location on the servo arm. Put one tube above the other at the mounting point (bulkhead) near the servo and secure the tubes. If you put them side by side, you WILL get more travel on one than the other as the servo reaches it's endpoints.

There are several methods for tying the pushrods together. You can wrap the ends with strong string and epoxy, then install a threaded connector in one pushrod and connect to the servo. You can also put threaded connectors in both pushrods, place a small 2 hole landing gear strap (with a third hole drilled in the middle) over both threads, secure it with 2-56 locknuts, then cut the excess thread off and install a third threaded connector between the middle hole and the servo arm.

There must be enough room between the servo arm and the hard point for the pushrod tube to allow for variations in pushrod spread as the servo moves and this is dependent on your connection, whether string/epoxy (pushrod tubes close together) or a landing gear strap (pushrod tubes farther apart). Just make sure that wherever your threaded servo connector ends up that it is even with the servo arm both horizontally and vertically, and take this into consideration before securing the pushrod tubes to the bulkhead.

Remember... Over/Under... NOT side by side.

Sorry, I have no pics.