All good , found it.
Its just a small screw under the fan section that moves a small lever and takes the brake off.
It worked and now i have adjusted the arm. Wasn't that bad after all. Pretty straight forward.
Now I'm looking to see how i can adjust the tool change Macro Z height ......From a few searches looks like lots of help and details.
hopefully something i can use out there...
Thanks again guys for your help
Very much appreciated