I am hoping someone can help.

I just purchased a 2017 PRSalpha Buddy BT48.

Let me first say this community and Shopbot themselves have been awesome!

So I am trying to put the Powerstick and deck back on after receiving it and I have a couple of questions that I am hoping someone here can help me with:

What does this screw/bolt do that is next to the X-axis pinion gear under the Powerstick? It looks like something should attach there but I have no idea?

Here is a picture of it:

What is this screw 2.jpg

Thank you,

Jimmy