Does anyone know where I could find one or the best way to build a kneepad for the Hydroslide Magna. I bought this board new back in '85. It was pretty much a flat piece of foam about 1/2" thick. I pulled it out of its slumber in the attic for the kids to ride and the kneepad is hard. My wife rode it yesterday, and the skin on her knees are still hurting tonight. More than likely, finding a pad will be impossible. Has anyone ever bought material to build one themselves and what did you use? I was thinking about the 3/4" rubberized insulation used in the HVAC trade. Thanks, Steven