Top: A ball and hooded ball link. This type is a
good choice for throttles and control surfaces of small
aircraft. The ball shank is too delicate for use on larger
Bottom: A typical helicopter style ball link.
second type of ball link has a ball with a hole in it and a link that is
not hooded — it looks like a tennis racquet without the strings.
ball is attached to a horn using a bolt and lock nut. These are
commonly used on larger aircraft and at almost all points on R/C
thing to look out for with this type of connector is that some of them can
crack and release the ball. The result is predictable.
ball link tends to be heavier and more
expensive than other type of pushrod connectors as well as over-kill for
smaller models. However, they are also very reliable.