Can you explain how the Armor Latch works and why it won't suffice to just put a dowel in the track?
The dual locking system helps prevent sliding glass doors from being lifted out of their track. Once the front door is secured, sliding glass doors are an inviting target. A broom stick in the track will not prevent the door from being lifted out of the track. Armor Latch helps prevent prying and also serves as a sliding glass door child safety lock.