Problem with fitting a new FUHR Latch Gearbox

[spike47]

Hi
Have just fit a new Latch Gearbox for my Euro lock on my uPVC door, it all works ok , but the 2 point locking mechanism keeps sliding down with its own weight and bring out the locking points, it is just not staying up when opened, there is no resistance to hold it up , ! as per vid attached !.
Any idea has to what the problem could be, I did spray W40 all allong the metal strip etc .
Spike
oops sorry can't upload a vid on here, any ideas how I can ?

 

[diy_fun_uk]

Does this help?

 

[spike47]

Does this help?

Hi
Thanks for that it does in a way, but mine is a Fuhr Gearbox, so not the same type of conecting it .

cheers
Spike

 

[crank39]

Try some handle spring cassettes first to hold the handle up