how to tighten thread on the valve lash adjustment screw

Yes, these are factory adjustable rockers on 65 commando .
How about the" Blue " locktite ? It doesn't lock tight permantent , you can still move adjuster if used .
We need some old timers to chime in on this one because they would probally recall how they tightened up that adjuster thread . there is a reason for that hole to access that threads .