Help with rocker arm adjustment

[conoco]

I have a clicking noise coming from the drivers side. I pulled the valve cover and while checking the rocker arms a couple of them seemed to be more loose than. Others. I can easily twist the push rods in some of them and I cant twist them at all on the others. Also everything I have read says there should be an allen hole to adjust. Mine just has a 5/8 nut.i know they are comp cam 1.52 but I cant find them on the web I have not adjusted any of them because I dont want to go to tight and really screw something up.
Can I just turn the 5/8 on each of them until they are barely able to twist back and forth? Also do I need to put cylinder #1 at TDC if I want to adjust each one? Or can I just start tightening the way it is now. Any help would be greatly appreciated