I am getting ready to hook up all the linkage for the motor . Does everyone remove the return spring on the throttle ? Is it extra strain on the servo to leave it on ?

A friend told me to get some carbon rod with Ti ends . So I got 4-40 carbon rod with Ti ends to glue on .I was told not to use a metal rod cause of transfer of vibration and signal to the servo . But whats the diff. with a stiff carbon rod . Key word "CARBON" . I have nylon balllink connectors I was gana use too . What are all you using to link the throttle to the servo ?? I got a HS-5625mg for the throttle servo . I am questioning my friends advice cause he has gone through throttle servos so he must be doing something wrong . He unhooks the throttle return spring and I think he uses a standard analog MG servo .

Edit:
Also does anyone replace the throttle arm on the carb with something else ?My HS-7955 servos came with 1" alum. arms that could work but I would have to modify it somehow so it won't slip on shaft . I haven't figured anything out on that yet other that making a mold somehow to fit in arms spline area .