Once in a while, a truly challenging part comes along. This was the case with the Raymarine Rotary Unicontroller Trackpad Dial (that's a mouthful!) This rotary dial is integral to the operation of these Raymarine Widescreen Displays (of which they made about 6 models). Unfortunately, the dials are somewhat flawed in that the flexible membrane, seen here from the inside, deteriorates over time. Eventually, they disintegrate completely rendering the entire display unit usele