The most common issue with single arm TV mounts is that the sag weight is a lot less than a dual arm TV mount. This means that single arm TV mounts can’t take as much weight before the arm starts to sag or twist. In most cases the sag is only noticeable when you are trying to get your TV to be level when the bracket is both pushed right in or pulled right out from the wall. When the TV is fully pushed in and level their is likely to be little or no sag. When the TV is pulled out from the wall this generates leverage on the arm of the bracket. If the TV is mounted offset from the pivot point then there is a possibility that one side of the TV may sag down more then the other. Ensuring that the TV is mounted over the top of the pivot points on the bracket will help to keep it level when both pushed in and pulled out.