I loosened the two bolts so I could aim the headlight. They were tight but I used the socket wrench to loosen them. Moved the headlight but can't seem to get the bolts to tighten up again. Any ideas?

There is two not fixated screw-nuts inside. Remove headlight reflector

(2 little screws on front), and you'll see them.

Thank you. I'd assumed the holes were threaded, but now that I see the fixture is plastic I understand.