CD adjustment set screws - which Loctite to use?

I recently did some work on my CD player. Clean, lube etc. The screws that hold in the laser rails have to be turned a certain amount then locked into place with adhesive. These rails are controlling the hight of the laser so if they aren't exact, it won't read some discs. The screws had clear blue glue on them from factory, but the only blue I know of Loctite Blue threadlocker, which is to be applied BEFORE putting in the screw. Did they just put it on after anyways and it works? or does anyone know what I should be using for this so that it will lock them in place but be easily removable in the future? The screws are metal, the hole/threads they screw into are plastic. TIA!
 
Blue Loctite would not work 100% as its a metal screw in plastic. The "glue" is usually a coloured lacquer to indicate that those screws have been set correctly. Much like paint pens are used in car factories to mark the nuts & bolts after they have been torqued up correctly...
 
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