I think it's really great that traxxas came out with those waterproof servos and I wanted a bunch for my boats, but they're $30 each. Does anyone know if you can just buy the waerproof servo case and swap inthe servos I already have in there? http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXTKL4&P=7