Aegis is right. There are always opposing viewpoints (even in his own post). The most important thing is to not have any moving metal to metal connections anywhere. (apart from electrical connectors and metal gears in the servos).

Personally I like the use of non digital medium torque standard type servos (such as HiTec HB 425's or 475's)for throttle and nyrods with plastic ball joints on the ends. I'm not a fan of plastic clevises directly onto the throttle arms because they can fail quite easily and the slop can give idling issues. This gives me peace of mind and it works for me