Put my boat in (2002 Outback) for the first time this season, and the speedos were not working. I looked underneath and the plastic paddle wheel (Airmar) in the thru-hull unit was gone. Has anyone else had to replace one of these? The Aimar manual says you can order a paddle wheel kit and replace the wheel by removing the unit, holding the new wheel in position and sliding a new shaft through the housing, and then apparently inserting the whole unit back into the hole. Does anyone have any tips/suggestions? The Airmar manual says there is only a 1 year expected life on the paddlewheel bearings on high speed (> 11mph) boats. You've got to be kidding. Is anyone else having to replace this?