A system and method for associating documents includes providing a plurality of scanned documents of different types and identifying a document type for each scanned document by comparing a determined pattern for each scanned document to known document patterns. A user selects a plurality of images to be laid out on a single background image. The selected control channel may be chosen if its corresponding 3GPP metric is greater than a specified threshold, where the threshold is a design parameter. A ball holder is disposed on an end of the tube.