This system is only available on the Ultra G4 Model.
This lets you drive posts without a post cap. Get more posts in faster and steer them easier with this cool system.
The pin and chain system has been used by some contractors for many years now. (Mostly in the South Island)
The idea of it is to guide your post or rock spike without using a post cap.
While it is a bit more difficult to get use, to you can see what your post is doing as you ram it. With a post cap the post can move when you lift the post cap after ramming.