After installing the 2 brackets, it became obvious that the bar would not slide into the brackets because the 2 rivot-like peices which the locking arms pivot on prevented the brackets from lying flat against the door frame. So I drilled holes where the rivots contacted the door frame, and this allowed the brackets to sit flat against the door frame. I put the bar into the brackets and tryed to do a pullup. Then I attemped to remove the bar from the brackets. The bar had wedged itself so tight into the brackets I had to pound one side up, while holding the locking brackets to allow the bar to release. Because the other side was so tight and inflexible, I couldn't raise the bar all the way out of the bracket unless I released both brackets at the same time, which requires 4 hands. Since I was going to use the bar only for pullups, I fugured I could remove the rivots with an electric drill, thereby removing the locking arms (the locking arms prevent the bar from lifting up, and would only be necessary when using the bar to hold your legs down when doing situps). Now I can remove the bar by myself, but my daughter isn't strong enough to remove it , so I sugested she doesn't use the bar when i am not at home. I would return it for a refund, but once you drill the holes for the bracket screws you really want something to cover those holes, and I already destroyed the locking arms so I probbly couldn't return it.