Power steering box

[Ironmike]

In the middle of a header install and was wondering what the locknut with the slotted screw is for on the top of my power steering assembly.
Hoping it's adjustment for steering play, maybe?

 

[bOb shingler]

In the middle of a header install and was wondering what the locknut with the slotted screw is for on the top of my power steering assembly.
Hoping it's adjustment for steering play, maybe?

yes it is.