Espagnolette

This is the explanation why the door to the patio locked itself and now is unlocked.  In the larger of the three holes on top there should be a square opening to accept the square rod from the handle. But it has been worn down to nothing.  This is no standard item to be found on a shelv at a locksmith.  But I managed to locate one of the very few that tries to repair these.  I drove 60 kms to show them this part.  They said - we think we can fix this in a couple of days.  Maybe..