Sunroof wont drop down

Hi All
I have now been struck by the sunroof challenge!
I have read all the threads out there but my issue is a little different.
The motor works fine, the sunroof opens ok, when closing I do get the clicking noise but with a little assistance the roof slides forward but then wont drop down to close? It then just clicks.

I am unsure wether the sunroof has moved forward enough to drop, but it certainly looks like it has.
I have disconnected the motor completely to see if I can manually close it but so far no joy.

Am I missing a trick here?Just want to close and never open again

Luckily it's sunny!! LOL
Cheers
Kevin

The mechanism has seized by the sounds of it. This strips the plastic gear teeth, which stops it closing.

That's what I thought, I'll take the whole thing apart at the weekend to see if I can free up the mechanism. I see it's possible to replace the cogs in the motor with a little effort, will look at this too.
Many thanks

you can get a metal replacement for the cog but you really need the hole thing overhauling as you could do more damage it is easy to replace the two sides with new cables and keep them greased regular say once every 2-3 months