i had already concluded that i would isolate whatever pushrod i chose from the throttle.  the servo arm is isolation enough at the servo end.  i just really wanted to know about cable vs solid pushrod.  how is a cable installed in order to give you adequate tension and yet still be flexible enough to bend around the fuel tank.  going to the hobby shop tomorrow and gonna look to see what options they have.  no use asking anyone there.  they have never had any answers.  but they do know what they have in stock in quantity.