Update 2020: rarely used it over 4 years. The 5th time I used it, it would not retract again. I had to fiddle with the button, which looked like it had slid sideways in the opening. I finally managed to " fix " it, but the next time I used it slide sideways into the opening again , and will not pop out no matter what I do. Update: rarely used it over 4 years. The 5th time I used it, it would not retract again. I had to fiddle with the button, which looked like it had slid sideways in the openingSee full review