The angled lights in between the rotators are Stingers. They should oscillate
side to side and up and down. Hopefully they work, if not when you get the domes off you can clean them up and put some white lithim grease on them.
The awesome thing about these bars is there are very easy to work on, if you can get the domes off. It sounds like the screws holding the domes on are striped or broken off.
I had a Federal Twinsonic that had broken/stripped screws, I took it to the local auto body shop and they were able to get them out with very little effort. The only other option I can think of is to drill the screws out, which is easier said than done, and tap the holes with tap and die set. Either way your looking at some work.
These are awesome bars, I've done a lot of work on the 74" monster on our first out Type 1 engine.