[Closed] Anyone know anything about conservatory roofs?

Could do with someone who knows about these things to see if I'm barking up the wrong tree here.

Anyway: during the recent storms the decorative cresting on the top of ours seemed to get wrenched away, and has ripped away some of the lead flashing on the wall. The decorative cresting looks like the first image here:

http://conservatorycleaner.com/cleaning-gallery/

I've got someone coming to sort out the flashing (there's no water getting in, which is good), but I've noticed something about the cresting- its mobile at one end, the "cap" end. I can lift it up and move it around just by getting a length of wood under it for purchase. It seems fixed at the other side, where it meets the external wall.

I had imagined it would be more secure than this, and I wondered if the wind had somehow got under it, lifted it up and to the side, and torn out the lead.

But I've had a look inside the conservatory, and hidden underneath the internal decorative plastic semi-circle in the middle of the roof there's a threaded plastic rod. This is used to hold the internal decorative plastic semi-circle in place- but I wonder: should the threaded rod also locate into the outer cap and lock it in place? If so, then its not- it spins around quite freely. I can't seem to get it to thread into anything.

Here's what the inside looks like:

[img] [/img]

And the outside part, the mobile bit:

[img] [/img]

Anyone have any ideas? Cheers!!