Roof light not lifting up

I went to wind up the roof light tonight and instead of winding up, there was a brief 'click', followed by continuous winding of the handle but with nothing happening to the roof light.  After a while, I decided to push the roof light up with my hand, and it did 'lock' into a position at about 45 deg.

So I put my head through the hole and could see that the black 'end blocks' of the cable were winding in and out with the rotation of the lifting handle, but they do not seem to be connected to the blocks on the arms which lift and lower the roof light.  It looks as if something has jumped out of place, but that the mechanism is basically still working OK.  I though I would ask if anyone has any experience of this problem, and/or how to go about fixing it before I wade in, only to end up with springs or whatever propelling themselves all over the place!!  

Any advice would be welcome, as we are due to go off in a few days time, and I reckon I've not much chance of getting it looked at by a workshop within 3/4 working days.

Ravenna ??? Peter

I have a 2012 Nuevo with a heki 3 rooflight, similar problem , I looked at the cable mechanism and found one of the screws holding the cable drive had come adrift it had been overtightened and had stripped the plastic . I replaced it with a slightly larger dia screw and a blob of locktite and all has been ok.Hope this is of some help!       Regards Paul

Thanks for all your comments.  I have had some of it apart today, and found that the support arm carriers have somehow got themselves in front of the blocks (on which they should sit) which wind in and out to raise the roof.  I cannot see how this can possibly have happened, so, thinking that if it could 'jump' off the block it must also be possible to ease it back on.  This proved to be incorrect, as I ende up breaking one of the plastic components.

So it looks like I'll have to have a complete new winding mechanism - at a cost of about £60, it could be worse