Does the arm collapse for storage? In this article The mounting arm does collapse for storage and adds only 5 inches to the WaterRower storage footprint. Related articles What color/stain upgrade package should I buy? How do I know if my WaterRower model is Upgrade Package compatible? Do I need a Commodule to use the Ergatta Upgrade Package? Screen and processing specifications I already have a mounting arm and a personal touchscreen - do I need to buy the whole package?