#28889
SaltyOne
Flatchatter

    A chain or wire from the handle in the centre of the opening side of the window to the corresponding point on the frame is a suitable and inexpensive alternative to something that blocks the track.   In fact, for very narrow sliding aluminium windows such as are often used in bathrooms and laundries it is the preferred option, because very narrow sliding windows can tilt when pushed up against a stopper in the lower rail, creating an opening of much more than allowed 125mm.