A friends Breva 1100 headlight went "loose" inside, turned out to be the plastic block that adjusts the headlight had got hot and brittle and consequently cracked. He did manage a temporary repair using epoxy, but in the end, had to purchase a replacement. I had a go at dismantling the old one. The outer chrome ring is held in with glue, i heated it in the oven to soften the glue, I did get it off in the end. Saw how the mechanism worked, but it was a one-way job and I broke too many bits prying it apart. I think his overheated because he put a perspex lens protector in front of the headlight and the wind didn't take the heat away