I work in a shop that sells Cannondales and a couple of other bike brands. We joke that the big rubber mallet in the workshop is only for Cannondale bikes because we seem to need to use it to do any major task on any Cannondale frame (removing Hollowgram crank axles, Lefty fork tubes, eccentric BBs, etc., etc.), but rarely have to use it on any other bikes. Therefore, the general rule of thumb to remove something from a Cannondale is to give it good bash.