The lock handle on my aluminium windows keeps falling off. The handle had previously fallen off when I first moved in a year ago and the landlord remounted it. Since then it has become loose a few times, but has been able to be screwed back in. Now the two screws no longer hold. The internal thread (?) on the window frame is only a few millimetres thick.
How can I securely remount this handle?
I am not sure of the screw size/type, but below is a photo.