I used to hit, on average, about 5-12 roos a week with the best night I hit 7. I smashed so many lights it was not funny. After a whack with a roo I had to do a job on a feedlot and one of the bloke said to me "I bet you tighten them right up eh". I have to admit I did. He said to just tighten them up enough to stop the wobble...and I did and from then on I only ever broke one. But that bugger of a roo was in front of a fence.
They moved about...up and down and too and fro....but only one broken one....
And again, I did the Murphy trick. I brought 2 new lenses (because they're replaceable) and never had to use them
I've never had a reflector go crook on the Cibie's. Do you know why they went off??
I intend on living for-ever....so far so good