The wheelchair bracket connects the Mount'n Mover and Post to the wheelchair vertical, horizontal, or with Angle Adjustment Plate. Slide the post into the wheelchair bracket, and clamp it with the quick-release lever. Here is a video that shows how-to Insert the Post For best results, the post should be mounted as close to vertical as possible. This makes it easier for a person to move independently The device is kept at the same height and tilt, no matter where it is moved.