Nottingham Space Deck and Space Arm question?

I have a Nottingham Analog Studios Space Deck with the Space Arm. At the pivot point, there is a set screw that the setup guide (as slim as it is) says "do not adjust." Well, I got this deck second or third hand and it has been adjusted....sooooo....does anyone have any info on just how the proper adjustment is achieved WITHOUT sending it to England???

Thanks, hope someone can help with this.
By "at the pivot point" do you mean the arm mount? There are two horizontal set screws in the arm mount that tighten the aluminum collet against the arm pillar. Loosening those set screws allows you to move the arm up or down to set VTA.
Call Brian at The Analog Room in San Jose, CA.