For Universal units shipped prior to November 1, 2015 we have found that, under certain conditions, the bracket that supports the camera platform may vibrate up and down, which will result in unwanted side to side vibration of the image. The type of surface the scanner is sitting on can make a big difference on whether this occurs or not. Hollow tables or thin cabinet tops can increase the likelihood while solid desks and work surfaces decrease the likelihood. To eliminate the possibility for vibration on most any surface, we have since installed a block brace on all subsequent units. If you have an earlier unit and feel you need this brace, we are happy to send it to you for free and it is easy to install with simple tools using the instructions below. Just email us your preferred physical shipping address and the number of Universal Scanners that you have and we will ship the blocks immediately.