Diode install question. Allen wrench

What do u guys use to tighten this inside screw? Or should i say how do u get back there to make it work? Is there a tiny allen wrench tool aside from what i have here or something? Im not very mechanically inclined so forgive me lol

 

You’re going to have to pull the housing out, tighten, and then put it back in. Is it just aimed wrong or wiggling around a bit. Most people just throw on a bunch of zip ties if it’s wiggling. Secures it right up

edit: and to pull the housing I believe it’s just the one screw and then it comes right out. Can’t remember

 

Crap. Ive got it zip tied in now. Just the screws loose on the housing so i can move it up and down to aim then was gonna tighten down when i got it aimed