The throttle cable in the 4*60 is a bit of a bear to get through if everything goes correctly. A very easy fix is to go to your local hardware store and purchase a 12" or longer 1/8" drill bit and drill out the existing cable at the firewall and drill a new hole all the way through to the throttle servo. If your tank is already installed, be VERY careful.

After drilling the hole, install the golden cable that fits in the 1/8" tube. The gold color cable is very stiff while still flexible enough to move freely around a few mild curves. Agreed, you have to spend the money for the drill bit, but I assure you that you will use it again many times in the future on other planes.