OK I grappled the PMA-2, then found out it was impossible to get it to the Unity node. Why? I grappled it on the bottom (SE) and not the 'top'(SW). (I was using the coordinates from the check list) My solution? I let it go and regrappled it while floating beside the shuttle.
Though I understand this isn't proper, it got the job done! Hey, you goota do what you gotta do......