Abstract: A marine control arm formed from an elongated arm member having a hollow shell with first, second, third and fourth internal guides. Each of the internal guides extends from an outer surface of the hollow shell to an inner surface of the hollow shell. The first and second internal guides are separated by a first distance, and the third and fourth internal guides are separated by a second distance. The control arm includes an insert having a plurality of knurls for mating with grooves in a throttle assembly. The insert has first and second wings for positioning the insert within the hollow shell. The first wing has a first width corresponding to the first distance, and the second wing has a second width corresponding to the second distance.